Cool Black

CSS

:root {
  --cool-black: #002e63;
  --cool-black-rgb: 0 46 99;
  --cool-black-oklch: oklch(0.308 0.105 255.9);
}

.element {
  color: var(--cool-black);
  background-color: hsl(212 100% 19%);
  border-color: oklch(0.308 0.105 255.9);
}

Tailwind CSS v4

@theme {
  --color-cool-black: #002e63;
  --color-cool-black-50: #e3f7ff;
  --color-cool-black-100: #d3eaff;
  --color-cool-black-200: #b9d6ff;
  --color-cool-black-300: #96b9ed;
  --color-cool-black-400: #75a1dc;
  --color-cool-black-500: #5588ca;
  --color-cool-black-600: #4973ab;
  --color-cool-black-700: #3a5c89;
  --color-cool-black-800: #274466;
  --color-cool-black-900: #1a2f48;
  --color-cool-black-950: #0b1b2f;
}

SCSS

$cool-black: #002e63;
$cool-black-rgb: 0, 46, 99;
$cool-black-light: mix(#fff, $cool-black, 20%);
$cool-black-dark: mix(#000, $cool-black, 20%);

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