<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <filter id="filter">
      <feOffset dx="5" dy="5"/>
    </filter>
  </defs>
  <g filter="url(#filter)">
    <rect x="0" y="0" width="20" height="20" fill="rgb(0,0,0)"/>
    <rect x="20" y="0" width="20" height="20" fill="rgb(102,0,0)"/>
    <rect x="40" y="0" width="20" height="20" fill="rgb(204,0,0)"/>
    <rect x="60" y="0" width="20" height="20" fill="rgb(255,0,0)"/>
    <rect x="20" y="20" width="20" height="20" fill="rgb(0,102,0)"/>
    <rect x="40" y="20" width="20" height="20" fill="rgb(0,204,0)"/>
    <rect x="60" y="20" width="20" height="20" fill="rgb(0,255,0)"/>
    <rect x="20" y="40" width="20" height="20" fill="rgb(0,0,102)"/>
    <rect x="40" y="40" width="20" height="20" fill="rgb(0,0,204)"/>
    <rect x="60" y="40" width="20" height="20" fill="rgb(0,0,255)"/>
    <rect x="80" y="40" width="20" height="20" fill="rgb(255,255,255)"/>
  </g>
</svg>