#08334E

CSS

:root {
  --sea-of-stars: #08334e;
  --sea-of-stars-rgb: 8 51 78;
  --sea-of-stars-oklch: oklch(0.308 0.066 242);
}

.element {
  color: var(--sea-of-stars);
  background-color: hsl(203 81% 17%);
  border-color: oklch(0.308 0.066 242);
}

Tailwind CSS v4

@theme {
  --color-sea-of-stars: #08334e;
  --color-sea-of-stars-50: #e6f8ff;
  --color-sea-of-stars-100: #d6ebfd;
  --color-sea-of-stars-200: #bdd8ef;
  --color-sea-of-stars-300: #9bbcd7;
  --color-sea-of-stars-400: #7ca4c3;
  --color-sea-of-stars-500: #5e8cae;
  --color-sea-of-stars-600: #507693;
  --color-sea-of-stars-700: #405f76;
  --color-sea-of-stars-800: #2d4657;
  --color-sea-of-stars-900: #1e303d;
  --color-sea-of-stars-950: #0e1c26;
}

SCSS

$sea-of-stars: #08334e;
$sea-of-stars-rgb: 8, 51, 78;
$sea-of-stars-light: mix(#fff, $sea-of-stars, 20%);
$sea-of-stars-dark: mix(#000, $sea-of-stars, 20%);

.element {
  color: $sea-of-stars;
  box-shadow: 0 0 0 2px rgba($sea-of-stars, 0.35);
}