#2D7576

CSS

:root {
  --prismarine: #2d7576;
  --prismarine-rgb: 45 117 118;
  --prismarine-oklch: oklch(0.518 0.071 196.5);
}

.element {
  color: var(--prismarine);
  background-color: hsl(181 45% 32%);
  border-color: oklch(0.518 0.071 196.5);
}

Tailwind CSS v4

@theme {
  --color-prismarine: #2d7576;
  --color-prismarine-50: #dffcfd;
  --color-prismarine-100: #cef0f1;
  --color-prismarine-200: #b2dedf;
  --color-prismarine-300: #8dc3c5;
  --color-prismarine-400: #6aacac;
  --color-prismarine-500: #459596;
  --color-prismarine-600: #3c7e7f;
  --color-prismarine-700: #306565;
  --color-prismarine-800: #214a4a;
  --color-prismarine-900: #163333;
  --color-prismarine-950: #071f1f;
}

SCSS

$prismarine: #2d7576;
$prismarine-rgb: 45, 117, 118;
$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);
}