Basic CSS concepts by naveen kumar veligeti

Naveen Kumar Veligeti
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Basic CSS Concepts
In this CSS tutorial I will not be able to show you everything there is about CSS, but you will
learn how to create nice looking CSS styled web pages.
After completing this tutorial, you should have enough information to explore CSS and web
design even further.
Things to remember about CSS:
Remember that CSS code is simply written instructions that tells Web browsers (like FireFox
and Internet Explorer) how to display things on a page. For example:
make text bold.
position things a page.
set the font style for a page or paragraph etc.
The sister language to CSS is HTML: code that tells the Web browser WHAT is actually in the
page.
… I know you knew that already, I just wanted to remind you!
CSS reduces the number of tags used
Because of the power of CSS, we will be able to reduce the number of HTML tags we use in a
page big time, all the while still being able to layout great looking pages using only 6 types (for
lack of better words) of HTML tags.
The tags we will use to layout the content:
1. <h> The Heading tags which range from ‘<h1></h1>’ to ‘<h6></h6>’, are going to be used to
mark/tag headings in our pages. So the most important heading will be wrapped in a <h1> tag
and the least important in a <h6> tag.
An example of a heading:
<h1><strong>CSS Template Layout</strong></h1>
This tells the browsers and the search engines too, that this page is primarily about: ‘CSS
Template Layout’
All browsers have a default size (for each<h> tag) as to how it renders text when placed
between these tags. Many of these defaults can be unusable (especially<h1>) because they
come out too big. But never fear, CSS is here. We will use CSS to make the text sizes more to
our liking.
2. <p> The Paragraph tag is used to mark parts of the pages as being ‘paragraphs’, simple enough.
Paragraph tags are what they call a ‘block element’; that means that it acts like a block where a

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space is automatically inserted before and after each <p> tag pair. You see it work in the
examples coming up.
3. <ul> and <ol> List tags will be used to create our menus. The tag <ul> is the ‘un-ordered list tag’
that creates a list with bullets or other images/icons that do not specify or denote an order;
hence the term ‘un-ordered’. The other list tag mentioned (<ol>) is the ‘ordered list tag’ and it
creates a list that, instead of bullets, the list elements are marked with numbers or letters. Code
examples to follow.
4. <div> We all know what the <div> tag is about since we all read the previous article, right? We
will use div’s to create containers for parts of our page. One div will be used to ‘hold’ our
navigational menu and another div to ‘hold’ the main page.
5. <a href> The most important tag in HTML: the ‘link tag’ or the ‘hyperlink tag’. This makes text
‘hyper’ so that when we click on it we can load another page or activate/call some JavaScript
(otherwise known as ECMA script).
6. <img> This is the ‘image tag’, allows you to link to images so that they show up in our pages. In
HTML images are not embedded into the actual page, instead the image tag (<img>) only points
to where the image is and the browser will attempt to load that image when a surfer loads your
HTML page.
That covers the HTML tags we will use in our layout! No need for table tags, <br> tags and
nasty <font> tags.
Basic CSS Concepts: Part 2
The basic page template
Go to the Web Designers Killer Handbook home page and grab the practice HTML page that we
will use as the starting template for this tutorial. You can find it under the heading: ‘To create
the practice HTML page do the following:’ Follow the instructions there and create your basic
HTML page.
Once you have created the template page, create a folder and name it something like:
‘myCSSwebsite’ and then drop the HTML page into it. In that same folder, create a new text
document and call it: ‘myCSS.css’. Once created open that file and paste in this template CSS
code and then save it:
/* Generic Selectors */
body {
font-family: Georgia, "Times New Roman", Times, serif;
font-size: 14px;

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color: #333333;
background-color: #F9F9F9;
}
p {
width: 80%;
}
li {
list-style-type: none;
line-height: 150%;
list-style-image: url(../images/arrowSmall.gif);
}
h1 {
font-size: 18px;
font-weight: bold;
color: #000000;
}
h2 {
font-size: 16px;
font-weight: bold;
color: #000000;
border-bottom: 1px solid #C6EC8C;
}
/**************** Pseudo classes ****************/
a:link {
color: #00CC00;
text-decoration: underline;
font-weight: bold;
}
li :link {
color: #00CC00;
text-decoration: none;
font-weight: bold;
}
a:visited {
color: #00CC00;
font-weight: bold;
}

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li a:visited {
color: #00CC00;
text-decoration: none;
font-weight: bold;
}
a:hover {
color: rgb(0, 96, 255);
padding-bottom: 5px;
font-weight: bold;
}
li a:hover {
display: block;
color: rgb(0, 96, 255);
padding-bottom: 5px;
font-weight: bold;
border-bottom-width: 1px;
border-bottom-style: solid;
border-bottom-color: #C6EC8C;
}
a:active {
color: rgb(255, 0, 102);
font-weight: bold;
}
/************************* ID's *************************/
#navigation {
position: absolute;
width: 210px;
height: 600px;
margin: 0;
margin-top: 50px;
border-right: 1px solid #C6EC8C;
font-weight: normal;
}
#centerDoc {
position: absolute;
padding: 0 0 20px 0; /*top right bottom left*/
margin-top: 50px;
margin-left: 235px;
}

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Don’t let the CSS freak you out, I will explain the important details and you will soon see how
easy it really is. One last thing for you to do before I finish this part of the tutorial, we need to
add some code to our HTML page.
In between the <body></body> tags you will need to insert this code:
<div id="navigation">
<h2>The Main navigation</h2>
</div>
<div id="centerDoc">
<h1>The Main Heading</h1>
<p>Go to the Web Designers Killer Handbook home page and grab the
practice HTML page that we will used as the starting template for this
tutorial. You can find it under the heading: 'To create the practice HTML
page do the following:'.</p>
<p>Follow the instructions there and create your basic HTML page
... and do it now!</p></div>
And in between the <head> </head> tags you will need to insert this:
<title>First CSS Tutorial</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="myCSS.css" rel="stylesheet" type="text/css">
With this in place we will be able to start styling our page. If you take a look at the HTML page
now you may be surprised to see that we already started!
If you haven’t set the page up yet, please do so to make sure you have everything working thus
far.
Layout a Page with CSS:
In Part 1 we created a classic two-column layout with left side navigation using CSS and only a
few types of HTML tags.

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Part 1 presented the code for the page and explained what HTML tags we were going to use.
Now we will look at the actual HTML code used so far and the CSS.
Our page so far is really very simple. As you may already know, all the content (text, images,
Flash etc) that the user sees when viewing a web page is marked-up/coded with HTML in-
between the <body> and </body> tags*.
In this case we have this:
</div>
<div id="centerDoc">
<p>Go to the Web Designers Killer Handbook home page and grab the practice
HTML page that we will used as the starting template for this tutorial.
You can find it under the heading: 'To create the practice HTML page do
the following:'.
Follow the instructions there and create your basic HTML page ... and
do it now!</p>
</div>
In the above code we see that we have 2 main sections demarked by using <div> tags. As you
learned in part one of this tutorial, <div> tags are designed to be used to create a ‘division’ in
the document or in other words create a container. We have created two such containers and
given them each of them a unique ID:
...
</div>
You will notice that the entire contents of the page are contained in one of these two major
page divisions. So the first questions are what are the rules of ID’s in HTML pages and why do
we use them and assign them to page elements like DIVs?
1. First of all you can assign ID’s to any HTML tag. So I could have assigned an ID to a <p> tag as
well.
2. An ID in a page should only be used once. That is to say that no two elements should have the
same ID. ID’s are meant to uniquely identify a page element. So in the above example we know
that there is only one page element with an ID of ‘navigation’ and only page element with an ID
of ‘centerDoc’. I like to use ID names that talk to you, it is pretty clear what is going on in each
division we created above.

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3. ID’s on HTML page elements (tags) are used in CSS. We can target ID’s in our CSS code to
change the appearance, position and even behavior of that element by referencing the ID of
the element.
Inside the <div> tags we use header tags (<h1> and <h2>) to set the headers. I speak to what
header tags mean in part 1 of this tutorial.
And finally I have some <p> tags, and of course I insert the text that makes up this simple page
in-between them.
Now I am going to jump to our CSS file that is attached to the HTML page. We attach the CSS
document with this line of code in between the <head> </head> tags:
<head>
<link href="myCSS.css" rel="stylesheet" type="text/css">
</head>
Like a normal page link we have an ‘href’ attribute this time pointing to a CSS document that
has all our CSS code that will affect this page since it is linked to it. This is not the only way to
associate CSS code to pages (there are a few other ways) but we will leave that to another
article. So in the above link we name the CSS file name with this: ‘href=”myCSS.css”‘ and we tell
the browser that the link is to a CSS page with this attribute: ‘type=”text/css”‘. All that is
important here is that the link point to a CSS file with the name: ‘myCSS.css’
So now that we got the style sheet linked to the document, lets look at some CSS code. This
first snippet of code ‘styles’ the unique ID’s we were talking about before:
#navigation {
position: absolute;
width: 210px;
height: 600px;
margin: 0;
margin-top: 0px;
}
#centerDoc {
position: absolute;
margin-top: 50px;
margin-left: 235px;
}
There is a lot going on here so we will focus on just a few elements for now. In the above
elements we have 2 selectors, one for each ID and each selectors are grouped/contained by
using the curly brackets: { }. So here is the CSS selectors code with all their guts removed:

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#navigation {
/*Look ma no CSS rules!*/
}
#centerDoc {
/*Look ma no CSS rules!*/
}
I just inserted the text: ‘/*Look ma no CSS rules!*/’ to show you where the CSS code would
normally be. So now you can see that anything in between the curly brackets is part of one
group or package that in CSS can generically be called a selector.
In our above examples you can see that there is some text that appears before a curly bracket.
That text gives a name to the selector. So in this case we have two selector names and thus to
selectors: #centerDoc and #navigation. So why do we have the # symbol in front of the text?
Why can’t we call it simply ‘centerDoc’ and ‘navigation’?
Layout a Page with CSS: Part 2
Like HTML and programming certain text in certain places have special meaning that tells the
system to do something particular. In this case whenever you have a # symbol in front of a
name of a CSS selector we are saying that this selector is a special type of selector called an ‘ID’
selector. What is so special about an ID selector? That type of selector can only be applied to
one element in the HTML page. Sounds familiar?
So those of you not asleep at the computer, now see that we have a CSS ID selector for each of
our HTML divs that have an ID, and they have the same corresponding names. So the CSS
selector #centerDoc applies to the div: ‘<div id=”centerDoc”>’ , you got it? Whatever CSS
rules/styles we choose to code into our ID selector will change what appears inside the
corresponding div. So for the div with the id of: ‘navigation’ we have these CSS rules:
#navigation {
position: absolute;
width: 210px;
height: 600px;
margin: 0;
margin-top: 0px;
}
Notice at the bottom we say all text will have a font-weight of ‘normal’:

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We could just as easily have said that we want all the text to appear in the div (the div with the
ID ‘navigation’) bold instead:
font-weight: bold;
This tutorial was about creating an easy to use page template so I will point out the 2 main
elements that make this thing work.
In our page the navigation div is sitting on the left and it has a border … why? It has a nice light
green 1 pixel border because I set this in my CSS:
Pretty self explanatory, no? I would suggest changing the color of the border and changing the
pixel thickness of the border and see how it looks.
Why is the navigation sitting on the left of the page while the centerDoc is to the right of it?
Well first thing to look at is this line in the navigation selector:
position: absolute;
This tells the browser to just place this div on the page as is. This is oversimplifying the subject,
but for our purposes this works for now.
The real magic in this is the CSS code for centerDoc:
#centerDoc {
position: absolute;
margin-top: 50px;
margin-left: 235px;
}
The line :
Tells the browser to insert 20px (pixels) of padding to the bottom of the div with the ID
‘centerDoc’.

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Let’s back up here a second. We just used something called ‘padding’ and it is what it sounds
like: Space that is wrapped around our element (tag).
CSS has this feature and concept of a box model that essentially is a box that wraps around
HTML elements. This box model consists of: padding, margins, borders and the actual content.
This allows us to place a border around elements and space elements in relation to other
elements. From the inside out it is ordered like so:
content -> padding -> border -> margin
So in our case anything in between our <div> tags is the ‘content’. Right after that comes the
padding. Then there is a border and finally a margin. Margin and padding may seem like the
same thing but if you think about it, you can see how being able to control the space before the
border (padding) and after the border (margins) can really effect your layouts.
In this example you notice that the navigation div sits higher up on the page than the centerDoc
div. This is not because of the order that which they appear in the HTML, as they normally
would without CSS, rather it is because of the margin settings I set for each selector; for
centerDoc I set the top margin to 50px:
margin-top: 50px;
And for the navigation div I set it to:
margin-top: 0px;
This sets its top margin to 0 pixels so it will therefore be 50 pixels higher than the centerDoc div.
I would suggest that you move the position of the navigation div under the center doc div in the
HTML just to see if it changes anything, you will see that where the div appears in the actual
HTML code has nothing to do with how it will appear to the user now that CSS positioning has
been used. Another thing to try is to play with the CSS values and see what happens, change
the padding, change the margins etc .
Let’s finish this discussion of CSS in Part 3.
1. There is more HTML that appears on top of the first <body> tag that is very important to
the page but does not actually directly have anything to do with what appears in the
page (from the users perspective) so I won’t discuss it in this article.

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we broke down the major sections of HTML on the page and established separation using DIV
tags with unique ID’s attached to them:
<div id="navigation"> ...</div>
<div id="centerDoc"> ...</div>
Using DIV’s (to position the major page sections) is the alternate method to what most people
use: tables. I would argue one method is not necessarily better than the other. But consider
that CSS is the ‘official’ method to position page elements and tables should only be used to
hold tabular data.
On the other hand there are simply times when using tables is much easier and CSS just doesn’t
cut it.
That said, our current layout (left or right side navigation) CSS is far easier to use and is an
overall better solution.
Now that we have that covered, everything gets really easy from here. We’ve established our
main document and the major sections are in place, all we need to do is add our text and
images.
Breaking down the page:
This page is simple, we have just a single heading:
And a single paragraph:
Go to the Web Designers Killer Handbook home page and grab the practice
HTML page that we will used as the starting template for this tutorial. You
can find it under the heading: 'To create the practice HTML page do the
following:'. Follow the instructions there and create your basic HTML page
... and do it now!
We define how the paragraphs and the headings will look in our CSS code:
p {

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width: 80%;
}
h1 {
font-size: 18px;
font-weight: bold;
color: #000000;
}
This is pretty much self-explanatory. The only thing that should be mentioned is that we set the
width of the <p> tags to 80%. This allows us to control all of our text width in one easy to edit
spot.
The only thing missing from the page is the actual navigation. The best and easiest way to do
this, is by using list (<li>) tags. That makes sense, since navigational menus are essentially a list
of pages.
We styled the list item tags with this CSS:
li {
list-style-type: none;
line-height: 150%;
}
The above code uses an image as the bullets for the list and makes the space between the listed
items 1 and ½ times larger than normal (I like a little more ‘breathing room’). You don’t have to
have an image for the bullets, you could leave it with no images and no bullets by just removing
the attribute:
Or you could use one of the built in bullet options: ‘disc’, ‘circle’ and ‘square’.
Next you should add to the HTML page an unordered list (<ul></ul>) in between the navigation
DIV’s just under the ‘main navigation’ heading:
<ul>
<li><a href="cssTutorialPage1.htm">Page One</a></li>

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<li><a href="cssTutorialPage2.htm">Page Two</a></li>
</ul>
To make things easier (for the purpose of the article), change the CSS affecting the list item tags
(<li>) so that we use a built in bullet:
li {
list-style-type: disc;
line-height: 150%;
}
Now we have the navigation!
That pretty much covers our goals for this tutorial, but we have just scratched the surface of
CSS. As you can see, we created a nice looking page, while using very few types of HTML tags.
At this time there isn’t much text on the page, but we could add to the page easily, building it
out to include lots of information and images with practically no HTML work at all!
Inserting images with CSS
This article assumes that you know at least basic HTML; you know what a tag is and how to use
simple tags like the <img> or the <p> tag. If this is confusing you, you need to read my tutorial
for total beginners on web design – it’s really easy and people seem to like it, so give it go!
Ok, I assume that everyone knows what images are, as we all have seen images on web pages.
Images are not technically inserted into a web page (to be nerd precise), rather images are
linked to web pages and typically we use the image tag (<img>) to create holding space (or a
reference to the image) for the image.
When someone loads a web page (by going to the URL), it is the browser, at that moment, that
actually gets the image from the web server and inserts it into the page for you to see – makes
sense?
This is different from using a program like MS Word for example, where with Word, when you
insert an image into a Word document, the image actually becomes ‘part’ of the actual

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document. When you save a Word file, all you need to keep track of is that one Word file, and
you know the images you inserted will be there when you open it again no matter where you
move the file.
Where as with an HTML page, since you are only referencing the images with the image tag,
you have to make sure that the images you are linking to always stay in the same spot in
relation to the web page. When people mess up that path between the HTML page and the
images it is referencing, you get that broken link icon that everyone loves to see. You are seeing
that broken link icon because the browser can’t find the image you are referencing in the <img>
tag.
Ok, if you didn’t know much about the mechanics of images loading in web pages, now you
know too much! Lets move to something practical.
Using CSS to insert images into your web pages
This next part is really easy to understand, easy to use and can be very powerful – triple bonus!
With CSS, all block-level and inline elements (tags) can have background images inserted into
them. Block - level tags are <p> and <div>.
Even though you can insert images into any type of tag (block-level or inline), I think it is better
form in most situations to use block-level tags for this sort of thing. But in reality it doesn’t
matter if you use block-level tags, or inline tags because you can turn any tag into a block-level
tag and vice versa; with this simple CSS code I change any tag to block-level:
display: block;
Or the reverse:
display: inline;
So what? Remember my newsletter where I talked about inserting backgrounds with CSS? In
the same way you can insert images in the backgrounds of your web pages, you can do it with
any other element. This combined with some extra padding and you have your headline image
where you want it.
Take a look at this code where I use this technique:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>CSS image placement</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

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<style type="text/css" media="screen">
#headline1 {
background-image: url(images/newsletter_headline1.gif);
background-repeat: no-repeat;
background-position: left top;
padding-top:68px;
margin-bottom:50px;
}
#headline2 {
background-image: url(images/newsletter_headline2.gif);
background-repeat: no-repeat;
background-position: left top;
padding-top:68px;
}
</style>
</head>
<body>
<div id="headline1">Some text … </div>
<div id="headline2">Some more text .. </div>
</body>
</html>
To keep this example easy to follow, I inserted the CSS code into the web page itself. Typically I
would place my CSS code in a separate CSS file and link to it so that I could reuse the CSS code
on many pages.
In the above CSS code you will notice that I insert a background image for each ID (headline1
and headline2) and I increase the padding at the top (padding-top:68px) to push down the text
to make space for the background images.
This may seem unclear now, so just take a look at the page and then pop open the source code
and check it out for yourself. Feel free to take a copy and play with the padding number and see
how it changes things. Why did I add 68px to the padding? The image is 68px tall, but I could
put any number I like to get the placement I want. Padding does not affect the background
image; it only affects the contents inside the tag/element. In this case I used <div> tags.
The 3 ways to insert CSS into your web pages
For some of you, this may sound like a real lame article. But you ought to give it a chance
because I don’t write about stuff you’ll never use! I avoid marginal, nerd centric ivory tower
blather like a cat avoids water.

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I’ve read hundreds (sadly, this is true) of those 2-inch thick nerd books (I don’t get out much)
and I can’t stand it when people waste paper on that kind of generally useless stuff. So read on,
eager student, and you will be well on your way to building your own killer web sites!
The wise people who created CSS came up with 3 basic ways for you to use CSS in your web
pages:
1. With an external file that you link to in your web page:
2.
<link href="myCSSfile.css" rel="stylesheet" type="text/css">
or using the import method:
<style type="text/css" media="all">
@import "myCSSfile.css";
</style>
Why use the import method versus the link method when using external style sheets? Use the
import method if you want to support really old browsers like Netscape 4.0.
Let me explain: Netscape can’t handle most CSS beyond font settings and colors, if it finds any
other types of CSS it could cause good old Netscape 4 to crash in some occasions or at the very
least mangle your page.
Netscape 4 does not understand the @import method of linking to a style sheet like the newer
browsers can, so Netscape just ignores it. You can use this to hide the fancy CCS code in the
external style sheet by using the @import method so all the good browsers can reference it
while keeping Netscape 4 out of the picture.
Netscape 4.0 is pretty much dead (that is really a good thing) so I personally don’t worry much
about it. But for some of you, it may be of concern so I thought it should be mentioned.
3. By creating a CSS block in the web page itself; typically inserted at the top of the web
page in between the <head> and </head> tags:
<head>
<style type="text/css">
p { padding-bottom: 12px; }
</style>
</head>

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4. By inserting the CSS code right on the tag itself:
<p style="padding-bottom:12px;">Your Text</p>
So some of you may be asking why have the 3 methods of including the CSS in a web page? The
answer is: flexibility and laziness! Ok I’m kidding about the laziness, replace it with ‘precision’.
So what the heck does that mean?
I think the easiest way to explain to you what’s going on, is by giving you real examples that
demonstrate the differences. Wait a second, don’t fall asleep … the examples are short and I
think that once you finish, you will see how easy it really is!
Another reason that you want to continue reading this article is that you will gain a good
understanding of some fundamental (and practical) CSS principles – remember that the
difference between people who are really good at what they do, and those who are not so
good, is in the mastery of the basics. Lets get down on it!
Method 1: Create a separate CSS file and link it to your web page(s)
The heading for this part of the article hints at why you would want to go through the trouble
of creating a separate CSS file instead of just typing in the CSS code in the web page itself. Can
you guess? Keep trying … times up! Did you get it? I could quote you some nerd centric
description that describes the advantage; the problem is that only nerds who already know
would understand!
In a nutshell: by keeping the CSS code in its own file, you can link that CSS file to as many web
pages as you want. This has two major advantages:
1. You will have much less code in all your HTML pages – makes the pages neater and easier to
manage and makes the web pages a little faster on the download. (Although this point is really
minor in most cases, and is really over blown in my opinion by some people)
2. It can potentially reduce the amount of work you have to do in a big way. Why you ask? Simple;
lets say you have 50 web pages where you’ve set the text to be black and the headline text
(text in between the <h3> tags for example) to blue. Then one day you decide you want to
change the color of the text. Since the CSS that controls the text color for the 50 pages is in one
CSS file, you can easily change the color of your text in all 50 pages by changing one line in the
CSS file!

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If on the other hand you had decided to include all your font color information in each page,
you would have had to change all 50 pages. This would have been even worse if you had been
using font tags, or CSS right on each tag, you would have to change the color settings/code on
all the <p> and <h3> tags in all 50 pages! I can tell you from experience that that sucks big time!
The rule: If you are going to have more than one web page with the same stylistic properties
(that look the same in some way) you should create a separate CSS file and link your web pages
to it.
Method 2: Create a CSS block in the web page itself
The Rule: Use this method if you want to override the CSS you have in a linked CSS file or if you
only have a one-page web site.
Now that we covered the first method of putting all your CSS code in a separate file and linking
to it, the other methods are easy to describe.
CSS stands for (is the acronym for): ‘Cascading Style Sheets.’ I think the words ‘style sheets’ in
CSS are self-describing … we know what ‘style’ in style sheets mean. But what is the meaning of
‘cascading’ in CSS?
The cascading effect in CSS
The word ‘cascading’ in CSS describes a cascading mechanism; that is to say that the CSS code
on the page itself will override the CSS code in a separate linked file. And subsequently, CSS
declared ‘inline’ on the tag itself would override all other CSS.
So let’s look a practical example; let’s say you have a web site with 50 pages where the layout
and fonts are the same on all 50 pages. Wisely you put the CSS information that sets the layout
and font choices in a separate style sheet, but for a particular page you need to change the
color of some of the text and add a border around a paragraph. This is a perfect example where
you might want to place a little CSS in the page itself since the color and border will be unique
to that page. Is this all sinking in?
Method 3: Embed the CSS right on the tags themselves (called inline CSS)
The Rule: Use this method on a unique element/tag that you want to affect with CSS.
An example can be with a special heading on the page where you want to have a little more
padding than you typically do for a heading. Instead of creating a class elsewhere that will only
be used on this one occasion, it makes sense to me to just include the CSS inline. I have to
stress that inline CSS is something you should rarely if ever use because it can get messy quick.

Basic CSS concepts by naveen kumar veligeti

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