CSS - Div Box Tops

Hello,

Hopefully this will be the last CSS problem I have

stunnazine.com is the site I'm working on

You can see that I have successfully implemented a black bar over my first DIV box on the left sidebar. So I copied that exact code and put it over each of the following DIV boxes, but nothing is happening...
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This is the css I used for the box tops:

.boxTop {width: 274px; height: 18px; background-color: black; top left no-repeat; font-family : arial;
color : #ffffff; font-size : 11px; font-weight : bold;}

The HTML code:
<div class="boxTop style12">
<div align="center">Heading Here</div>
</div>
<div class="listedsv">
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Listedsv is the name of the first DIV box.

I don't get why when it's the EXACT same code, and put in the same spot, it doesn't work on any of the following DIV boxes - and I even tried renaming each DIV box Listedsv (instead of Listed2 or Listed3 or whatever) but that didn't work either.

Any suggestions?