ch.svg 297 Bytes
<svg xmlns="http://www.w3.org/2000/svg" id="flag-icon-css-ch" viewBox="0 0 640 480">
  <g fill-rule="evenodd" stroke-width="1pt">
    <path fill="#d52b1e" d="M0 0h640v480H0z"/>
    <g fill="#fff">
      <path d="M170 195h300v90H170z"/>
      <path d="M275 90h90v300h-90z"/>
    </g>
  </g>
</svg>