#607A74

CSS

:root {
  --underwater-world: #607a74;
  --underwater-world-rgb: 96 122 116;
  --underwater-world-oklch: oklch(0.557 0.032 179.4);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(166 12% 43%);
  border-color: oklch(0.557 0.032 179.4);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #607a74;
  --color-underwater-world-50: #ecf8f6;
  --color-underwater-world-100: #ddece8;
  --color-underwater-world-200: #c6d9d5;
  --color-underwater-world-300: #a7bdb8;
  --color-underwater-world-400: #8ba59f;
  --color-underwater-world-500: #708d87;
  --color-underwater-world-600: #5f7872;
  --color-underwater-world-700: #4c605b;
  --color-underwater-world-800: #374642;
  --color-underwater-world-900: #26312e;
  --color-underwater-world-950: #141d1a;
}

SCSS

$underwater-world: #607a74;
$underwater-world-rgb: 96, 122, 116;
$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);
}