#5073BC

CSS

:root {
  --song-of-the-sea: #5073bc;
  --song-of-the-sea-rgb: 80 115 188;
  --song-of-the-sea-oklch: oklch(0.564 0.12 263.6);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(221 45% 53%);
  border-color: oklch(0.564 0.12 263.6);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #5073bc;
  --color-song-of-the-sea-50: #e5f5ff;
  --color-song-of-the-sea-100: #d5e8ff;
  --color-song-of-the-sea-200: #bcd4ff;
  --color-song-of-the-sea-300: #9ab6f6;
  --color-song-of-the-sea-400: #799de6;
  --color-song-of-the-sea-500: #5c83d6;
  --color-song-of-the-sea-600: #4e6fb4;
  --color-song-of-the-sea-700: #3e5991;
  --color-song-of-the-sea-800: #2a426c;
  --color-song-of-the-sea-900: #1c2d4c;
  --color-song-of-the-sea-950: #0d1a32;
}

SCSS

$song-of-the-sea: #5073bc;
$song-of-the-sea-rgb: 80, 115, 188;
$song-of-the-sea-light: mix(#fff, $song-of-the-sea, 20%);
$song-of-the-sea-dark: mix(#000, $song-of-the-sea, 20%);

.element {
  color: $song-of-the-sea;
  box-shadow: 0 0 0 2px rgba($song-of-the-sea, 0.35);
}