Anthracite Blue

CSS

:root {
  --anthracite-blue: #3d475e;
  --anthracite-blue-rgb: 61 71 94;
  --anthracite-blue-oklch: oklch(0.399 0.041 266.3);
}

.element {
  color: var(--anthracite-blue);
  background-color: hsl(222 21% 30%);
  border-color: oklch(0.399 0.041 266.3);
}

Tailwind CSS v4

@theme {
  --color-anthracite-blue: #3d475e;
  --color-anthracite-blue-50: #f0f5ff;
  --color-anthracite-blue-100: #e2e8f6;
  --color-anthracite-blue-200: #cdd4e7;
  --color-anthracite-blue-300: #aeb7cd;
  --color-anthracite-blue-400: #939eb8;
  --color-anthracite-blue-500: #7986a2;
  --color-anthracite-blue-600: #677189;
  --color-anthracite-blue-700: #525b6e;
  --color-anthracite-blue-800: #3b4251;
  --color-anthracite-blue-900: #292e38;
  --color-anthracite-blue-950: #161b23;
}

SCSS

$anthracite-blue: #3d475e;
$anthracite-blue-rgb: 61, 71, 94;
$anthracite-blue-light: mix(#fff, $anthracite-blue, 20%);
$anthracite-blue-dark: mix(#000, $anthracite-blue, 20%);

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