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Cascading Style Sheets are now the standard way to define the presentation of your HTML pages, from fonts and colors to the complete layout of a page. They are much more efficient than using HTML on every page to define the look of your site. CSS is becoming a more important language to know every day, so the sooner you have a grip on this most elegant of presentational languages, the better.

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There are 3 ways to implement CSS commands into your site:

* Use one CSS file for all your pages. This is the best way to do it.
* Integrate CSS commands into the head of each of your documents.
* Use the style attribute to put CSS code directly into a HTML element.

CSS allows you to use all three of these methods in glorious tandem, inheriting and overriding values as you go.

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One Central Stylesheet

This is how you should use most of your CSS. You write just one .css file and have all your pages referencing it. This way, a change to anything in this one file will adjust this thing (a font, for example) across your whole site. You could change your entire colour scheme with one modification if you want, over an unlimited number of pages. That's one of the things CSS was designed for - flexibility.