#4A6E9E

CSS

:root {
  --song-of-the-sea: #4a6e9e;
  --song-of-the-sea-rgb: 74 110 158;
  --song-of-the-sea-oklch: oklch(0.532 0.087 255.9);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(214 36% 45%);
  border-color: oklch(0.532 0.087 255.9);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4a6e9e;
  --color-song-of-the-sea-50: #e6f7ff;
  --color-song-of-the-sea-100: #d6e9ff;
  --color-song-of-the-sea-200: #bed6fa;
  --color-song-of-the-sea-300: #9cb9e4;
  --color-song-of-the-sea-400: #7da1d1;
  --color-song-of-the-sea-500: #5f88bf;
  --color-song-of-the-sea-600: #5173a1;
  --color-song-of-the-sea-700: #405c81;
  --color-song-of-the-sea-800: #2d4460;
  --color-song-of-the-sea-900: #1e2f43;
  --color-song-of-the-sea-950: #0e1b2b;
}

SCSS

$song-of-the-sea: #4a6e9e;
$song-of-the-sea-rgb: 74, 110, 158;
$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);
}