#011442

CSS

:root {
  --infinite-night: #011442;
  --infinite-night-rgb: 1 20 66;
  --infinite-night-oklch: oklch(0.213 0.091 261.8);
}

.element {
  color: var(--infinite-night);
  background-color: hsl(222 97% 13%);
  border-color: oklch(0.213 0.091 261.8);
}

Tailwind CSS v4

@theme {
  --color-infinite-night: #011442;
  --color-infinite-night-50: #e8f6ff;
  --color-infinite-night-100: #d8e8ff;
  --color-infinite-night-200: #c0d5fc;
  --color-infinite-night-300: #a0b8e7;
  --color-infinite-night-400: #819fd5;
  --color-infinite-night-500: #6486c3;
  --color-infinite-night-600: #5571a5;
  --color-infinite-night-700: #445b84;
  --color-infinite-night-800: #2f4362;
  --color-infinite-night-900: #202e45;
  --color-infinite-night-950: #101b2d;
}

SCSS

$infinite-night: #011442;
$infinite-night-rgb: 1, 20, 66;
$infinite-night-light: mix(#fff, $infinite-night, 20%);
$infinite-night-dark: mix(#000, $infinite-night, 20%);

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