Dark Horizon

CSS

:root {
  --dark-horizon: #666699;
  --dark-horizon-rgb: 102 102 153;
  --dark-horizon-oklch: oklch(0.532 0.079 283.4);
}

.element {
  color: var(--dark-horizon);
  background-color: hsl(240 20% 50%);
  border-color: oklch(0.532 0.079 283.4);
}

Tailwind CSS v4

@theme {
  --color-dark-horizon: #666699;
  --color-dark-horizon-50: #f2f2ff;
  --color-dark-horizon-100: #e5e5ff;
  --color-dark-horizon-200: #d0d0f6;
  --color-dark-horizon-300: #b3b2df;
  --color-dark-horizon-400: #9899cc;
  --color-dark-horizon-500: #7f7fb9;
  --color-dark-horizon-600: #6b6c9d;
  --color-dark-horizon-700: #56567e;
  --color-dark-horizon-800: #3e3f5d;
  --color-dark-horizon-900: #2a2b41;
  --color-dark-horizon-950: #18192a;
}

SCSS

$dark-horizon: #666699;
$dark-horizon-rgb: 102, 102, 153;
$dark-horizon-light: mix(#fff, $dark-horizon, 20%);
$dark-horizon-dark: mix(#000, $dark-horizon, 20%);

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