Sombre Night

CSS

:root {
  --sombre-night: #161e34;
  --sombre-night-rgb: 22 30 52;
  --sombre-night-oklch: oklch(0.239 0.044 267.9);
}

.element {
  color: var(--sombre-night);
  background-color: hsl(224 41% 15%);
  border-color: oklch(0.239 0.044 267.9);
}

Tailwind CSS v4

@theme {
  --color-sombre-night: #161e34;
  --color-sombre-night-50: #f0f5ff;
  --color-sombre-night-100: #e2e8f7;
  --color-sombre-night-200: #cdd4e8;
  --color-sombre-night-300: #aeb7cf;
  --color-sombre-night-400: #939eb9;
  --color-sombre-night-500: #7986a4;
  --color-sombre-night-600: #67718b;
  --color-sombre-night-700: #525a6f;
  --color-sombre-night-800: #3b4252;
  --color-sombre-night-900: #292e39;
  --color-sombre-night-950: #161b23;
}

SCSS

$sombre-night: #161e34;
$sombre-night-rgb: 22, 30, 52;
$sombre-night-light: mix(#fff, $sombre-night, 20%);
$sombre-night-dark: mix(#000, $sombre-night, 20%);

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