#5F7C73

CSS

:root {
  --underwater-world: #5f7c73;
  --underwater-world-rgb: 95 124 115;
  --underwater-world-oklch: oklch(0.561 0.036 174);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(161 13% 43%);
  border-color: oklch(0.561 0.036 174);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #5f7c73;
  --color-underwater-world-50: #ebf9f5;
  --color-underwater-world-100: #dcece7;
  --color-underwater-world-200: #c5dad3;
  --color-underwater-world-300: #a5beb7;
  --color-underwater-world-400: #89a69d;
  --color-underwater-world-500: #6e8e84;
  --color-underwater-world-600: #5d7870;
  --color-underwater-world-700: #4a6059;
  --color-underwater-world-800: #364741;
  --color-underwater-world-900: #25312d;
  --color-underwater-world-950: #131d1a;
}

SCSS

$underwater-world: #5f7c73;
$underwater-world-rgb: 95, 124, 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);
}