#112B3E

CSS

:root {
  --sea-of-stars: #112b3e;
  --sea-of-stars-rgb: 17 43 62;
  --sea-of-stars-oklch: oklch(0.279 0.048 242.8);
}

.element {
  color: var(--sea-of-stars);
  background-color: hsl(205 57% 15%);
  border-color: oklch(0.279 0.048 242.8);
}

Tailwind CSS v4

@theme {
  --color-sea-of-stars: #112b3e;
  --color-sea-of-stars-50: #eaf7ff;
  --color-sea-of-stars-100: #dbeaf7;
  --color-sea-of-stars-200: #c4d7e8;
  --color-sea-of-stars-300: #a4bbcf;
  --color-sea-of-stars-400: #87a2b9;
  --color-sea-of-stars-500: #6b8aa4;
  --color-sea-of-stars-600: #5b758a;
  --color-sea-of-stars-700: #485e6f;
  --color-sea-of-stars-800: #344551;
  --color-sea-of-stars-900: #233039;
  --color-sea-of-stars-950: #121c23;
}

SCSS

$sea-of-stars: #112b3e;
$sea-of-stars-rgb: 17, 43, 62;
$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);
}