#426BB7

CSS

:root {
  --song-of-the-sea: #426bb7;
  --song-of-the-sea-rgb: 66 107 183;
  --song-of-the-sea-oklch: oklch(0.536 0.128 261.7);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(219 47% 49%);
  border-color: oklch(0.536 0.128 261.7);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #426bb7;
  --color-song-of-the-sea-50: #e2f6ff;
  --color-song-of-the-sea-100: #d2e8ff;
  --color-song-of-the-sea-200: #b8d5ff;
  --color-song-of-the-sea-300: #96b7fa;
  --color-song-of-the-sea-400: #749eea;
  --color-song-of-the-sea-500: #5584da;
  --color-song-of-the-sea-600: #4870b8;
  --color-song-of-the-sea-700: #3a5994;
  --color-song-of-the-sea-800: #26426e;
  --color-song-of-the-sea-900: #1a2d4e;
  --color-song-of-the-sea-950: #0a1a33;
}

SCSS

$song-of-the-sea: #426bb7;
$song-of-the-sea-rgb: 66, 107, 183;
$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);
}