I am currently having trouble getting rid of a sliver of white...

Here is an example page: http://m.stackoverflow.quickmediasolutions.com/view_question.php?id=97969&site=serverfault

As you can see, the answers have a sliver of white stuffed between the top of the 'button' and the content.

Here is some relevant code:

<!-- this is the top of the 'button' -->
<div class='top'></div>

<!-- right here is where the space is -->
<div class='content'></div>

.top {
    height: 5px;
}
.content {
    display: block;
    padding-left: 10px;
}