#597E75

CSS

:root {
  --underwater-world: #597e75;
  --underwater-world-rgb: 89 126 117;
  --underwater-world-oklch: oklch(0.562 0.044 177.8);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(165 17% 42%);
  border-color: oklch(0.562 0.044 177.8);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #597e75;
  --color-underwater-world-50: #e8faf5;
  --color-underwater-world-100: #d9ede8;
  --color-underwater-world-200: #c1dbd5;
  --color-underwater-world-300: #a0bfb8;
  --color-underwater-world-400: #83a79e;
  --color-underwater-world-500: #669086;
  --color-underwater-world-600: #577a71;
  --color-underwater-world-700: #45625b;
  --color-underwater-world-800: #324842;
  --color-underwater-world-900: #22322d;
  --color-underwater-world-950: #111e1a;
}

SCSS

$underwater-world: #597e75;
$underwater-world-rgb: 89, 126, 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);
}