<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="800" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg">
    <defs>

        <linearGradient id="gradient1" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" style="stop-color:#000000;"/>
            <stop offset="100%" style="stop-color:#ffffff;"/>
        </linearGradient>

        <style type="text/css">
         #canvas { fill: url(#gradient1); }
        </style>
    </defs>
    <rect id="canvas" width="100%" height="100%" x="0" y="0" />
</svg>