SOURCE

<svg width="900" height="900" >
    <defs>
        <filter id="mohu">
            <feGaussianBlur stdDeviation="3"/>

        </filter>

        <filter id="f1" x="0" y="0" width="200%" height="200%">
         <feOffset result="offOut" in="SourceGraphic" dx="20" dy="20" />
         <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
         <feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
        </filter>

    </defs>s
    <circle cx="100" cy="100" r="50" fill="gold"
    filter="url(#f1)"/>
</svg>