#466EA0

CSS

:root {
  --song-of-the-sea: #466ea0;
  --song-of-the-sea-rgb: 70 110 160;
  --song-of-the-sea-oklch: oklch(0.531 0.091 254.7);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(213 39% 45%);
  border-color: oklch(0.531 0.091 254.7);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #466ea0;
  --color-song-of-the-sea-50: #e5f7ff;
  --color-song-of-the-sea-100: #d5eaff;
  --color-song-of-the-sea-200: #bcd6fc;
  --color-song-of-the-sea-300: #9abae6;
  --color-song-of-the-sea-400: #79a1d4;
  --color-song-of-the-sea-500: #5b89c2;
  --color-song-of-the-sea-600: #4e74a3;
  --color-song-of-the-sea-700: #3e5c83;
  --color-song-of-the-sea-800: #2b4461;
  --color-song-of-the-sea-900: #1d2f44;
  --color-song-of-the-sea-950: #0d1b2c;
}

SCSS

$song-of-the-sea: #466ea0;
$song-of-the-sea-rgb: 70, 110, 160;
$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);
}