Wiki plugin template

Okay I’ve launched the wiki.

But why does my CSS conflict on these pages? See the diagonal shaped box on the wiki pages:

http://www.ppcplans.com/wiki/

http://www.ppcplans.com/wiki/main/

CSS Code is:

media=”screen”

.drop-shadow {

position: relative;

width: 90%;

}

It works fine on all my other pages. So why not here?