#273B4C

CSS

:root {
  --depths-of-the-nile: #273b4c;
  --depths-of-the-nile-rgb: 39 59 76;
  --depths-of-the-nile-oklch: oklch(0.343 0.039 245);
}

.element {
  color: var(--depths-of-the-nile);
  background-color: hsl(208 32% 23%);
  border-color: oklch(0.343 0.039 245);
}

Tailwind CSS v4

@theme {
  --color-depths-of-the-nile: #273b4c;
  --color-depths-of-the-nile-50: #edf7ff;
  --color-depths-of-the-nile-100: #dee9f5;
  --color-depths-of-the-nile-200: #c7d6e5;
  --color-depths-of-the-nile-300: #a8bacb;
  --color-depths-of-the-nile-400: #8ca1b5;
  --color-depths-of-the-nile-500: #71899f;
  --color-depths-of-the-nile-600: #607486;
  --color-depths-of-the-nile-700: #4c5d6c;
  --color-depths-of-the-nile-800: #37444f;
  --color-depths-of-the-nile-900: #252f37;
  --color-depths-of-the-nile-950: #141c22;
}

SCSS

$depths-of-the-nile: #273b4c;
$depths-of-the-nile-rgb: 39, 59, 76;
$depths-of-the-nile-light: mix(#fff, $depths-of-the-nile, 20%);
$depths-of-the-nile-dark: mix(#000, $depths-of-the-nile, 20%);

.element {
  color: $depths-of-the-nile;
  box-shadow: 0 0 0 2px rgba($depths-of-the-nile, 0.35);
}