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Forum Moderators: not2easy
You should start by studying w3schools tutorial. [w3schools.com], where you will find out alll about css and you can even take part in a quiz.
I can kick you off with this however:
<div id="container">Your content starts here</div>
I will suggest you visit the above link, as it should get you off to a good start.
Post your full code if you want us to take a look!