fi.svg 237 Bytes
<svg xmlns="http://www.w3.org/2000/svg" id="flag-icon-css-fi" viewBox="0 0 640 480">
  <path fill="#fff" d="M0 0h640v480H0z"/>
  <path fill="#003580" d="M0 174.5h640v131H0z"/>
  <path fill="#003580" d="M175.5 0h130.9v480h-131z"/>
</svg>