In your style.css file, around line 540, you should see this:
#access {
background: #96B905;
background: -moz-linear-gradient(#252525, #0A0A0A);
background: -o-linear-gradient(#252525, #0A0A0A);
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#252525), to(#0A0A0A));
background: -webkit-linear-gradient(#252525, #0A0A0A);
-webkit-box-shadow: rgba(0, 0, 0, 0.4) 0px 1px 2px;
-moz-box-shadow: rgba(0, 0, 0, 0.4) 0px 1px 2px;
box-shadow: rgba(0, 0, 0, 0.4) 0px 0px 0px;
clear: both;
display: block;
float: left;
margin: 0 auto 6px;
width: 100%;
}
You need to get rid of all the background declarations besides the first, so it should look like this:
#access {
background: #96B905;
-webkit-box-shadow: rgba(0, 0, 0, 0.4) 0px 1px 2px;
-moz-box-shadow: rgba(0, 0, 0, 0.4) 0px 1px 2px;
box-shadow: rgba(0, 0, 0, 0.4) 0px 0px 0px;
clear: both;
display: block;
float: left;
margin: 0 auto 6px;
width: 100%;
}