lu.svg 228 Bytes
<svg xmlns="http://www.w3.org/2000/svg" id="flag-icon-css-lu" viewBox="0 0 640 480">
  <path fill="#00a1de" d="M0 240h640v240H0z"/>
  <path fill="#ed2939" d="M0 0h640v240H0z"/>
  <path fill="#fff" d="M0 160h640v160H0z"/>
</svg>