#4F77A8

CSS

:root {
  --song-of-the-sea: #4f77a8;
  --song-of-the-sea-rgb: 79 119 168;
  --song-of-the-sea-oklch: oklch(0.561 0.089 254.1);
}

.element {
  color: var(--song-of-the-sea);
  background-color: hsl(213 36% 48%);
  border-color: oklch(0.561 0.089 254.1);
}

Tailwind CSS v4

@theme {
  --color-song-of-the-sea: #4f77a8;
  --color-song-of-the-sea-50: #e5f7ff;
  --color-song-of-the-sea-100: #d5eaff;
  --color-song-of-the-sea-200: #bcd7fb;
  --color-song-of-the-sea-300: #9abae5;
  --color-song-of-the-sea-400: #7aa1d2;
  --color-song-of-the-sea-500: #5c89c0;
  --color-song-of-the-sea-600: #4e74a2;
  --color-song-of-the-sea-700: #3e5d82;
  --color-song-of-the-sea-800: #2b4460;
  --color-song-of-the-sea-900: #1d2f44;
  --color-song-of-the-sea-950: #0d1b2c;
}

SCSS

$song-of-the-sea: #4f77a8;
$song-of-the-sea-rgb: 79, 119, 168;
$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);
}