#0A787B

CSS

:root {
  --prismarine: #0a787b;
  --prismarine-rgb: 10 120 123;
  --prismarine-oklch: oklch(0.521 0.087 198);
}

.element {
  color: var(--prismarine);
  background-color: hsl(182 85% 26%);
  border-color: oklch(0.521 0.087 198);
}

Tailwind CSS v4

@theme {
  --color-prismarine: #0a787b;
  --color-prismarine-50: #dafdff;
  --color-prismarine-100: #c7f1f3;
  --color-prismarine-200: #a9e0e3;
  --color-prismarine-300: #81c5c9;
  --color-prismarine-400: #5aaeb1;
  --color-prismarine-500: #29979b;
  --color-prismarine-600: #268083;
  --color-prismarine-700: #1e6769;
  --color-prismarine-800: #144c4c;
  --color-prismarine-900: #0d3435;
  --color-prismarine-950: #012020;
}

SCSS

$prismarine: #0a787b;
$prismarine-rgb: 10, 120, 123;
$prismarine-light: mix(#fff, $prismarine, 20%);
$prismarine-dark: mix(#000, $prismarine, 20%);

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