Hydrogen Blue

CSS

:root {
  --hydrogen-blue: #33476d;
  --hydrogen-blue-rgb: 51 71 109;
  --hydrogen-blue-oklch: oklch(0.399 0.069 262.5);
}

.element {
  color: var(--hydrogen-blue);
  background-color: hsl(219 36% 31%);
  border-color: oklch(0.399 0.069 262.5);
}

Tailwind CSS v4

@theme {
  --color-hydrogen-blue: #33476d;
  --color-hydrogen-blue-50: #ebf5ff;
  --color-hydrogen-blue-100: #dce8ff;
  --color-hydrogen-blue-200: #c6d5f3;
  --color-hydrogen-blue-300: #a6b8dc;
  --color-hydrogen-blue-400: #899fc8;
  --color-hydrogen-blue-500: #6d86b5;
  --color-hydrogen-blue-600: #5d7299;
  --color-hydrogen-blue-700: #4a5b7a;
  --color-hydrogen-blue-800: #34435b;
  --color-hydrogen-blue-900: #242e3f;
  --color-hydrogen-blue-950: #131b28;
}

SCSS

$hydrogen-blue: #33476d;
$hydrogen-blue-rgb: 51, 71, 109;
$hydrogen-blue-light: mix(#fff, $hydrogen-blue, 20%);
$hydrogen-blue-dark: mix(#000, $hydrogen-blue, 20%);

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