#617C75

CSS

:root {
  --underwater-world: #617c75;
  --underwater-world-rgb: 97 124 117;
  --underwater-world-oklch: oklch(0.563 0.033 177.5);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(164 12% 43%);
  border-color: oklch(0.563 0.033 177.5);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #617c75;
  --color-underwater-world-50: #ecf8f5;
  --color-underwater-world-100: #ddece8;
  --color-underwater-world-200: #c6d9d4;
  --color-underwater-world-300: #a6bdb8;
  --color-underwater-world-400: #8ba59e;
  --color-underwater-world-500: #6f8e86;
  --color-underwater-world-600: #5e7871;
  --color-underwater-world-700: #4b605b;
  --color-underwater-world-800: #374642;
  --color-underwater-world-900: #25312d;
  --color-underwater-world-950: #141d1a;
}

SCSS

$underwater-world: #617c75;
$underwater-world-rgb: 97, 124, 117;
$underwater-world-light: mix(#fff, $underwater-world, 20%);
$underwater-world-dark: mix(#000, $underwater-world, 20%);

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