#070B13

CSS

:root {
  --dark-rift: #070b13;
  --dark-rift-rgb: 7 11 19;
  --dark-rift-oklch: oklch(0.149 0.019 262.4);
}

.element {
  color: var(--dark-rift);
  background-color: hsl(220 46% 5%);
  border-color: oklch(0.149 0.019 262.4);
}

Tailwind CSS v4

@theme {
  --color-dark-rift: #070b13;
  --color-dark-rift-50: #f2f5fb;
  --color-dark-rift-100: #e5e8ee;
  --color-dark-rift-200: #d0d4dd;
  --color-dark-rift-300: #b3b7c1;
  --color-dark-rift-400: #989faa;
  --color-dark-rift-500: #7f8693;
  --color-dark-rift-600: #6c727c;
  --color-dark-rift-700: #565b64;
  --color-dark-rift-800: #3f4349;
  --color-dark-rift-900: #2b2e33;
  --color-dark-rift-950: #181b1e;
}

SCSS

$dark-rift: #070b13;
$dark-rift-rgb: 7, 11, 19;
$dark-rift-light: mix(#fff, $dark-rift, 20%);
$dark-rift-dark: mix(#000, $dark-rift, 20%);

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