Create a shadow effect in SVG
A simple example of a shadow effect in SVG.
<!DOCTYPE html>
<html>
<body>
<svg height="140" width="140">
<defs>
<filter id="filter" x="0" y="0" width="200%" height="200%">
<feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
<feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
</filter>
</defs>
<rect width="90" height="90" stroke="red" stroke-width="20" fill="blue" filter="url(#filter)" />
</svg>
</body>
</html>