Code:
#sideviewmenu .backdrop { /* Radial gradient background behind menu layer */
position: absolute;
left: 0;
top: 0;
content: '';
display: block;
width: 100%;
height: 100%;
z-index: -1;
background: rgb(125,126,125); /* Begin Radial gradient background */
background: -moz-radial-gradient(center, ellipse cover, rgba(125,126,125,1) 0%, rgba(14,14,14,1) 100%); /* FF3.6+ */
background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,rgba(125,126,125,1)), color-stop(100%,rgba(14,14,14,1))); /* Chrome,Safari4+ */
background: -webkit-radial-gradient(center, ellipse cover, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-radial-gradient(center, ellipse cover, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* Opera 12+ */
background: -ms-radial-gradient(center, ellipse cover, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* IE10+ */
background: radial-gradient(ellipse at center, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#7d7e7d', endColorstr='#0e0e0e',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
opacity: 0.9;
}
To edit it, just replace the above with the background color or gradient of your choice. A good tool for generating CSS gradients visually is the following:
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