#02153E

CSS

:root {
  --infinite-night: #02153e;
  --infinite-night-rgb: 2 21 62;
  --infinite-night-oklch: oklch(0.212 0.083 261.3);
}

.element {
  color: var(--infinite-night);
  background-color: hsl(221 94% 13%);
  border-color: oklch(0.212 0.083 261.3);
}

Tailwind CSS v4

@theme {
  --color-infinite-night: #02153e;
  --color-infinite-night-50: #e9f6ff;
  --color-infinite-night-100: #dae8ff;
  --color-infinite-night-200: #c2d5f9;
  --color-infinite-night-300: #a1b8e3;
  --color-infinite-night-400: #839fd0;
  --color-infinite-night-500: #6786be;
  --color-infinite-night-600: #5772a0;
  --color-infinite-night-700: #465b80;
  --color-infinite-night-800: #31435f;
  --color-infinite-night-900: #212e43;
  --color-infinite-night-950: #101b2b;
}

SCSS

$infinite-night: #02153e;
$infinite-night-rgb: 2, 21, 62;
$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);
}