Guess this is the bit in the css that determines those:
.ads{
float: right;
margin-right: 28px;
margin-top: 8px;
margin-bottom: 0px;
}
.ads.125ads {
padding:3px 0 0 0;
text-align:left;
}
.ads h2 {
color: #181818;
font: bold 16px Arial, Helvetica, sans-serif;
margin: 0 0 0px 0;
padding: 2px 0px 3px 0px;
text-align: center;
text-transform: uppercase;
}
.ads img {
padding: 4px;
border: #bebebe 1px solid;
background: #bebebe;
}
.ads a:link img {
padding: 4px;
border: #bebebe 1px solid;
background: #bebebe;
}
.ads a:hover img {
padding: 4px;
border: #ffc04e 1px solid;
background: #ffc04e;
}