#4E73BC

CSS

:root {
  --song-of-the-sea: #4e73bc;
  --song-of-the-sea-rgb: 78 115 188;
  --song-of-the-sea-oklch: oklch(0.562 0.121 262.8);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(220 45% 52%);
  border-color: oklch(0.562 0.121 262.8);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4e73bc;
  --color-song-of-the-sea-50: #e4f6ff;
  --color-song-of-the-sea-100: #d4e8ff;
  --color-song-of-the-sea-200: #bbd4ff;
  --color-song-of-the-sea-300: #99b7f6;
  --color-song-of-the-sea-400: #789ee6;
  --color-song-of-the-sea-500: #5a84d6;
  --color-song-of-the-sea-600: #4d70b5;
  --color-song-of-the-sea-700: #3d5991;
  --color-song-of-the-sea-800: #29426c;
  --color-song-of-the-sea-900: #1c2d4c;
  --color-song-of-the-sea-950: #0c1a32;
}

SCSS

$song-of-the-sea: #4e73bc;
$song-of-the-sea-rgb: 78, 115, 188;
$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);
}