<div class="flag pride-1978" role="img" aria-label="1978 Pride Flag. Seven vertical bars of equal size: red, orange, yellow, green, turquoise, blue, and indigo"></div>

.flag {
  width: 80vmin;
  aspect-ratio: 70 / 45;
}

.pride-1978 {
  background:
    linear-gradient(red 0 14.28%, orange 0 28.57%, yellow 0 42.85%, green 0 57.14%, darkturquoise 0 71.42%, blue 0 85.71%, indigo 0);
}