#11386A

CSS

:root {
  --lost-in-space: #11386a;
  --lost-in-space-rgb: 17 56 106;
  --lost-in-space-oklch: oklch(0.343 0.097 256.4);
}

.element {
  color: var(--lost-in-space);
  background-color: hsl(214 72% 24%);
  border-color: oklch(0.343 0.097 256.4);
}

Tailwind CSS v4

@theme {
  --color-lost-in-space: #11386a;
  --color-lost-in-space-50: #e5f7ff;
  --color-lost-in-space-100: #d4eaff;
  --color-lost-in-space-200: #bbd6ff;
  --color-lost-in-space-300: #99b9ea;
  --color-lost-in-space-400: #78a1d8;
  --color-lost-in-space-500: #5a88c6;
  --color-lost-in-space-600: #4d73a7;
  --color-lost-in-space-700: #3d5c86;
  --color-lost-in-space-800: #2a4463;
  --color-lost-in-space-900: #1c2f46;
  --color-lost-in-space-950: #0c1b2d;
}

SCSS

$lost-in-space: #11386a;
$lost-in-space-rgb: 17, 56, 106;
$lost-in-space-light: mix(#fff, $lost-in-space, 20%);
$lost-in-space-dark: mix(#000, $lost-in-space, 20%);

.element {
  color: $lost-in-space;
  box-shadow: 0 0 0 2px rgba($lost-in-space, 0.35);
}