Cetacean Blue

CSS

:root {
  --cetacean-blue: #001440;
  --cetacean-blue-rgb: 0 20 64;
  --cetacean-blue-oklch: oklch(0.21 0.089 260.6);
}

.element {
  color: var(--cetacean-blue);
  background-color: hsl(221 100% 13%);
  border-color: oklch(0.21 0.089 260.6);
}

Tailwind CSS v4

@theme {
  --color-cetacean-blue: #001440;
  --color-cetacean-blue-50: #e8f6ff;
  --color-cetacean-blue-100: #d8e9ff;
  --color-cetacean-blue-200: #c0d5fb;
  --color-cetacean-blue-300: #9fb8e6;
  --color-cetacean-blue-400: #809fd3;
  --color-cetacean-blue-500: #6486c1;
  --color-cetacean-blue-600: #5572a3;
  --color-cetacean-blue-700: #445b83;
  --color-cetacean-blue-800: #2f4361;
  --color-cetacean-blue-900: #202e44;
  --color-cetacean-blue-950: #0f1b2c;
}

SCSS

$cetacean-blue: #001440;
$cetacean-blue-rgb: 0, 20, 64;
$cetacean-blue-light: mix(#fff, $cetacean-blue, 20%);
$cetacean-blue-dark: mix(#000, $cetacean-blue, 20%);

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