<linearGradient id="MyGradient" x1="0" y1="0" x2="400" y2="150">
<stop offset="0" style="stop-color:white"/>
<stop offset="0.5" style="stop-color:blue"/>
<stop offset="1" style="stop-color:red"/>
</linearGradient>
- - -
<rect x="20" y="20" width="360" height="110"
style="fill:url(#MyGradient)/>
