#61857F

CSS

:root {
  --underwater-world: #61857f;
  --underwater-world-rgb: 97 133 127;
  --underwater-world-oklch: oklch(0.588 0.041 183.5);
}

.element {
  color: var(--underwater-world);
  background-color: hsl(170 16% 45%);
  border-color: oklch(0.588 0.041 183.5);
}

Tailwind CSS v4

@theme {
  --color-underwater-world: #61857f;
  --color-underwater-world-50: #e9f9f7;
  --color-underwater-world-100: #d9edea;
  --color-underwater-world-200: #c2dad7;
  --color-underwater-world-300: #a1bfba;
  --color-underwater-world-400: #84a7a1;
  --color-underwater-world-500: #679089;
  --color-underwater-world-600: #587974;
  --color-underwater-world-700: #46615d;
  --color-underwater-world-800: #324743;
  --color-underwater-world-900: #22312e;
  --color-underwater-world-950: #111d1b;
}

SCSS

$underwater-world: #61857f;
$underwater-world-rgb: 97, 133, 127;
$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);
}