<?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="16" height="16" version="1.1" xmlns="http://www.w3.org/2000/svg">

<defs>
    <radialGradient id="thumb-fill" gradientUnits="userSpaceOnUse"
        cx="7.5" cy="7.5" r="8" >
        <stop offset="80%" stop-color="#fff" />
        <stop offset="100%" stop-color="#aaa" />
    </radialGradient>
</defs>

<!-- Background -->
<circle cx="8" cy="8" r="8" fill="url(#thumb-fill)" />

</svg>