#5074B5

CSS

:root {
  --song-of-the-sea: #5074b5;
  --song-of-the-sea-rgb: 80 116 181;
  --song-of-the-sea-oklch: oklch(0.562 0.109 261.5);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(219 41% 51%);
  border-color: oklch(0.562 0.109 261.5);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #5074b5;
  --color-song-of-the-sea-50: #e5f6ff;
  --color-song-of-the-sea-100: #d5e8ff;
  --color-song-of-the-sea-200: #bcd5ff;
  --color-song-of-the-sea-300: #9ab7f0;
  --color-song-of-the-sea-400: #7a9fdf;
  --color-song-of-the-sea-500: #5d85ce;
  --color-song-of-the-sea-600: #4f71ae;
  --color-song-of-the-sea-700: #3f5a8c;
  --color-song-of-the-sea-800: #2b4268;
  --color-song-of-the-sea-900: #1d2e49;
  --color-song-of-the-sea-950: #0d1a30;
}

SCSS

$song-of-the-sea: #5074b5;
$song-of-the-sea-rgb: 80, 116, 181;
$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);
}