<svg xmlns="http://www.w3.org/2000/svg" id="flag-icon-css-se" viewBox="0 0 640 480">
  <path fill="#066aa7" d="M0 0h640v480H0z"/>
  <path fill="#fecc00" d="M0 192h640v96H0z"/>
  <path fill="#fecc00" d="M176 0h96v480h-96z"/>
</svg>