CSS = Cascading Style Sheets, this is done primarily to externalize the ‘look and feel’ of a web page from the actual ‘data’ being presented.
There are several ways to do this…
1. External file (most common)… add the following to the <head>
section of your page:
<meta http-equiv="Content-Style-Type" content="text/css" />
<link rel="stylesheet" type="text/css" href="/filename.css" media="all" />
2. Inline (usually in the <head>
section of every page):
<style type="text/css" media="screen">
<!--
... // some stuff here.
-->
</style>
3. Inline (on individual tags):
<div style="color:red;">Red text</div>
NOTES:
1. Media types (common – though others exist!):
* screen
* print
* all
2. Guideline: always use lowercase names in your CSS, MUST start with an alpha (not numeric).