pl.svg 225 Bytes
<svg xmlns="http://www.w3.org/2000/svg" height="480" width="640" viewBox="0 0 640 480">
  <g fill-rule="evenodd">
    <path fill="#fff" d="M640 480H0V0h640z"/>
    <path fill="#dc143c" d="M640 480H0V240h640z"/>
  </g>
</svg>