#000714

CSS

:root {
  --dark-rift: #000714;
  --dark-rift-rgb: 0 7 20;
  --dark-rift-oklch: oklch(0.127 0.036 249.9);
}

.element {
  color: var(--dark-rift);
  background-color: hsl(219 100% 4%);
  border-color: oklch(0.127 0.036 249.9);
}

Tailwind CSS v4

@theme {
  --color-dark-rift: #000714;
  --color-dark-rift-50: #eef6ff;
  --color-dark-rift-100: #e0e9f4;
  --color-dark-rift-200: #cad6e4;
  --color-dark-rift-300: #abb9ca;
  --color-dark-rift-400: #8fa1b3;
  --color-dark-rift-500: #75889d;
  --color-dark-rift-600: #637385;
  --color-dark-rift-700: #4f5c6b;
  --color-dark-rift-800: #39444e;
  --color-dark-rift-900: #272f37;
  --color-dark-rift-950: #151b21;
}

SCSS

$dark-rift: #000714;
$dark-rift-rgb: 0, 7, 20;
$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);
}