Ocean Night

CSS

:root {
  --ocean-night: #637195;
  --ocean-night-rgb: 99 113 149;
  --ocean-night-oklch: oklch(0.551 0.059 268);
}

.element {
  color: var(--ocean-night);
  background-color: hsl(223 20% 49%);
  border-color: oklch(0.551 0.059 268);
}

Tailwind CSS v4

@theme {
  --color-ocean-night: #637195;
  --color-ocean-night-50: #eef5ff;
  --color-ocean-night-100: #e0e7fc;
  --color-ocean-night-200: #cad4ee;
  --color-ocean-night-300: #abb7d6;
  --color-ocean-night-400: #8f9ec2;
  --color-ocean-night-500: #7585ae;
  --color-ocean-night-600: #637193;
  --color-ocean-night-700: #4f5a76;
  --color-ocean-night-800: #394257;
  --color-ocean-night-900: #272e3d;
  --color-ocean-night-950: #151a26;
}

SCSS

$ocean-night: #637195;
$ocean-night-rgb: 99, 113, 149;
$ocean-night-light: mix(#fff, $ocean-night, 20%);
$ocean-night-dark: mix(#000, $ocean-night, 20%);

.element {
  color: $ocean-night;
  box-shadow: 0 0 0 2px rgba($ocean-night, 0.35);
}