/* reference: https://en.wikipedia.org/wiki/Flag_of_Vietnam */

:root {
  --flag-height: 2;
  --flag-width: 3;
  --vietnam-red: #da251d;
  --vietnam-yellow: #ffde00;
}

#vietnam {
  position: relative;
  height: 180px;
  aspect-ratio: var(--flag-width) / var(--flag-height);
  background: var(--vietnam-red);
}

#vietnam::before {
  content: "";
  position: absolute;
  width: 40%;
  height: 40%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30"><polygon fill="%23ffde00" points="15,0 19,11 30,11 21,17 24,28 15,22 6,28 9,17 0,11 11,11"/></svg>') no-repeat center/contain;
}