#290093

CSS

:root {
  --dramatic-blue: #290093;
  --dramatic-blue-rgb: 41 0 147;
  --dramatic-blue-oklch: oklch(0.321 0.197 277.8);
}

.element {
  color: var(--dramatic-blue);
  background-color: hsl(257 100% 29%);
  border-color: oklch(0.321 0.197 277.8);
}

Tailwind CSS v4

@theme {
  --color-dramatic-blue: #290093;
  --color-dramatic-blue-50: #e9f0ff;
  --color-dramatic-blue-100: #dae1ff;
  --color-dramatic-blue-200: #c3cbff;
  --color-dramatic-blue-300: #a4aaff;
  --color-dramatic-blue-400: #868dff;
  --color-dramatic-blue-500: #6d6eff;
  --color-dramatic-blue-600: #5c5edb;
  --color-dramatic-blue-700: #494bb0;
  --color-dramatic-blue-800: #323785;
  --color-dramatic-blue-900: #22265e;
  --color-dramatic-blue-950: #121340;
}

SCSS

$dramatic-blue: #290093;
$dramatic-blue-rgb: 41, 0, 147;
$dramatic-blue-light: mix(#fff, $dramatic-blue, 20%);
$dramatic-blue-dark: mix(#000, $dramatic-blue, 20%);

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