<defs>
    <filter id="dropshadow">
        <feOffset result="offOut" in="SourceAlpha" dx="2" dy="2"></feOffset>
        <feGaussianBlur result="blurOut" in="offOut" stdDeviation="2"></feGaussianBlur>
        <feBlend in="SourceGraphic" in2="blurOut" mode="normal"></feBlend>
    </filter>
</defs>