Konkikyō Blue

CSS

:root {
  --konkikyo-blue: #191f45;
  --konkikyo-blue-rgb: 25 31 69;
  --konkikyo-blue-oklch: oklch(0.257 0.071 273.6);
}

.element {
  color: var(--konkikyo-blue);
  background-color: hsl(232 47% 18%);
  border-color: oklch(0.257 0.071 273.6);
}

Tailwind CSS v4

@theme {
  --color-konkikyo-blue: #191f45;
  --color-konkikyo-blue-50: #eff4ff;
  --color-konkikyo-blue-100: #e1e7ff;
  --color-konkikyo-blue-200: #cbd2f3;
  --color-konkikyo-blue-300: #adb5dc;
  --color-konkikyo-blue-400: #919cc9;
  --color-konkikyo-blue-500: #7783b6;
  --color-konkikyo-blue-600: #656f99;
  --color-konkikyo-blue-700: #50597b;
  --color-konkikyo-blue-800: #39415b;
  --color-konkikyo-blue-900: #272d40;
  --color-konkikyo-blue-950: #151a29;
}

SCSS

$konkikyo-blue: #191f45;
$konkikyo-blue-rgb: 25, 31, 69;
$konkikyo-blue-light: mix(#fff, $konkikyo-blue, 20%);
$konkikyo-blue-dark: mix(#000, $konkikyo-blue, 20%);

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