#4873C3

CSS

:root {
  --song-of-the-sea: #4873c3;
  --song-of-the-sea-rgb: 72 115 195;
  --song-of-the-sea-oklch: oklch(0.563 0.133 261.7);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(219 51% 52%);
  border-color: oklch(0.563 0.133 261.7);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4873c3;
  --color-song-of-the-sea-50: #e2f6ff;
  --color-song-of-the-sea-100: #d1e8ff;
  --color-song-of-the-sea-200: #b7d4ff;
  --color-song-of-the-sea-300: #94b7fc;
  --color-song-of-the-sea-400: #729eed;
  --color-song-of-the-sea-500: #5383de;
  --color-song-of-the-sea-600: #476fbb;
  --color-song-of-the-sea-700: #385996;
  --color-song-of-the-sea-800: #254270;
  --color-song-of-the-sea-900: #192d4f;
  --color-song-of-the-sea-950: #0a1a34;
}

SCSS

$song-of-the-sea: #4873c3;
$song-of-the-sea-rgb: 72, 115, 195;
$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);
}