#4D73BF

CSS

:root {
  --song-of-the-sea: #4d73bf;
  --song-of-the-sea-rgb: 77 115 191;
  --song-of-the-sea-oklch: oklch(0.564 0.126 262.9);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(220 47% 53%);
  border-color: oklch(0.564 0.126 262.9);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4d73bf;
  --color-song-of-the-sea-50: #e4f5ff;
  --color-song-of-the-sea-100: #d3e8ff;
  --color-song-of-the-sea-200: #bad4ff;
  --color-song-of-the-sea-300: #98b7f8;
  --color-song-of-the-sea-400: #779de9;
  --color-song-of-the-sea-500: #5983d9;
  --color-song-of-the-sea-600: #4b6fb7;
  --color-song-of-the-sea-700: #3c5993;
  --color-song-of-the-sea-800: #28426e;
  --color-song-of-the-sea-900: #1b2d4d;
  --color-song-of-the-sea-950: #0c1a33;
}

SCSS

$song-of-the-sea: #4d73bf;
$song-of-the-sea-rgb: 77, 115, 191;
$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);
}