#153953

CSS

:root {
  --sea-of-stars: #153953;
  --sea-of-stars-rgb: 21 57 83;
  --sea-of-stars-oklch: oklch(0.332 0.062 243.2);
}

.element {
  color: var(--sea-of-stars);
  background-color: hsl(205 60% 20%);
  border-color: oklch(0.332 0.062 243.2);
}

Tailwind CSS v4

@theme {
  --color-sea-of-stars: #153953;
  --color-sea-of-stars-50: #e7f8ff;
  --color-sea-of-stars-100: #d8ebfc;
  --color-sea-of-stars-200: #bfd8ee;
  --color-sea-of-stars-300: #9ebbd6;
  --color-sea-of-stars-400: #7fa3c1;
  --color-sea-of-stars-500: #628bac;
  --color-sea-of-stars-600: #537691;
  --color-sea-of-stars-700: #425e75;
  --color-sea-of-stars-800: #2f4556;
  --color-sea-of-stars-900: #20303c;
  --color-sea-of-stars-950: #0f1c26;
}

SCSS

$sea-of-stars: #153953;
$sea-of-stars-rgb: 21, 57, 83;
$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);
}