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CSS won't work

#1
I have a css problem, placing a div into the ad_header... for exapmple

I place this code in the ad_header template:
Code:
<div id="mybanner">bannercodeblabla</div>
in my extra.css for example I write
Code:
.mybanner {float: right;}
The problem is, that the css is not applied to the div. What am I doing wrong?