Blue Hour

CSS

:root {
  --blue-hour: #0034ab;
  --blue-hour-rgb: 0 52 171;
  --blue-hour-oklch: oklch(0.391 0.195 262.9);
}

.element {
  color: var(--blue-hour);
  background-color: hsl(222 100% 34%);
  border-color: oklch(0.391 0.195 262.9);
}

Tailwind CSS v4

@theme {
  --color-blue-hour: #0034ab;
  --color-blue-hour-50: #daf5ff;
  --color-blue-hour-100: #c8e8ff;
  --color-blue-hour-200: #abd3ff;
  --color-blue-hour-300: #86b4ff;
  --color-blue-hour-400: #5e99ff;
  --color-blue-hour-500: #3b7bff;
  --color-blue-hour-600: #3369dc;
  --color-blue-hour-700: #2854b1;
  --color-blue-hour-800: #163e84;
  --color-blue-hour-900: #0e2b5e;
  --color-blue-hour-950: #031740;
}

SCSS

$blue-hour: #0034ab;
$blue-hour-rgb: 0, 52, 171;
$blue-hour-light: mix(#fff, $blue-hour, 20%);
$blue-hour-dark: mix(#000, $blue-hour, 20%);

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