#5D7D73

CSS

:root {
  --underwater-world: #5d7d73;
  --underwater-world-rgb: 93 125 115;
  --underwater-world-oklch: oklch(0.562 0.04 173.6);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(161 15% 43%);
  border-color: oklch(0.562 0.04 173.6);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #5d7d73;
  --color-underwater-world-50: #eaf9f4;
  --color-underwater-world-100: #dbece7;
  --color-underwater-world-200: #c4dad3;
  --color-underwater-world-300: #a3beb6;
  --color-underwater-world-400: #87a69c;
  --color-underwater-world-500: #6b8f84;
  --color-underwater-world-600: #5b7970;
  --color-underwater-world-700: #496159;
  --color-underwater-world-800: #354741;
  --color-underwater-world-900: #24312d;
  --color-underwater-world-950: #131d1a;
}

SCSS

$underwater-world: #5d7d73;
$underwater-world-rgb: 93, 125, 115;
$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);
}