#00787B

CSS

:root {
  --prismarine: #00787b;
  --prismarine-rgb: 0 120 123;
  --prismarine-oklch: oklch(0.52 0.088 197.8);
}

.element {
  color: var(--prismarine);
  background-color: hsl(181 100% 24%);
  border-color: oklch(0.52 0.088 197.8);
}

Tailwind CSS v4

@theme {
  --color-prismarine: #00787b;
  --color-prismarine-50: #d9fdff;
  --color-prismarine-100: #c7f1f3;
  --color-prismarine-200: #a8e0e3;
  --color-prismarine-300: #7fc6c9;
  --color-prismarine-400: #57afb1;
  --color-prismarine-500: #24989b;
  --color-prismarine-600: #228083;
  --color-prismarine-700: #1b6769;
  --color-prismarine-800: #124c4c;
  --color-prismarine-900: #0b3535;
  --color-prismarine-950: #002020;
}

SCSS

$prismarine: #00787b;
$prismarine-rgb: 0, 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);
}