#110D36

CSS

:root {
  --infinite-night: #110d36;
  --infinite-night-rgb: 17 13 54;
  --infinite-night-oklch: oklch(0.196 0.077 281);
}

.element {
  color: var(--infinite-night);
  background-color: hsl(246 61% 13%);
  border-color: oklch(0.196 0.077 281);
}

Tailwind CSS v4

@theme {
  --color-infinite-night: #110d36;
  --color-infinite-night-50: #f1f3ff;
  --color-infinite-night-100: #e4e5ff;
  --color-infinite-night-200: #cfd1f5;
  --color-infinite-night-300: #b1b3de;
  --color-infinite-night-400: #969acb;
  --color-infinite-night-500: #7d80b8;
  --color-infinite-night-600: #6a6d9c;
  --color-infinite-night-700: #54577d;
  --color-infinite-night-800: #3c405d;
  --color-infinite-night-900: #2a2c41;
  --color-infinite-night-950: #17192a;
}

SCSS

$infinite-night: #110d36;
$infinite-night-rgb: 17, 13, 54;
$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);
}