#4B73C0

CSS

:root {
  --song-of-the-sea: #4b73c0;
  --song-of-the-sea-rgb: 75 115 192;
  --song-of-the-sea-oklch: oklch(0.563 0.128 262.3);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(219 48% 52%);
  border-color: oklch(0.563 0.128 262.3);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4b73c0;
  --color-song-of-the-sea-50: #e3f6ff;
  --color-song-of-the-sea-100: #d3e8ff;
  --color-song-of-the-sea-200: #b9d4ff;
  --color-song-of-the-sea-300: #96b7fa;
  --color-song-of-the-sea-400: #759dea;
  --color-song-of-the-sea-500: #5683da;
  --color-song-of-the-sea-600: #4a6fb8;
  --color-song-of-the-sea-700: #3b5994;
  --color-song-of-the-sea-800: #27426e;
  --color-song-of-the-sea-900: #1a2d4e;
  --color-song-of-the-sea-950: #0b1a33;
}

SCSS

$song-of-the-sea: #4b73c0;
$song-of-the-sea-rgb: 75, 115, 192;
$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);
}