#2E0099

CSS

:root {
  --dramatic-blue: #2e0099;
  --dramatic-blue-rgb: 46 0 153;
  --dramatic-blue-oklch: oklch(0.333 0.202 279.2);
}

.element {
  color: var(--dramatic-blue);
  background-color: hsl(258 100% 30%);
  border-color: oklch(0.333 0.202 279.2);
}

Tailwind CSS v4

@theme {
  --color-dramatic-blue: #2e0099;
  --color-dramatic-blue-50: #eaefff;
  --color-dramatic-blue-100: #dce1ff;
  --color-dramatic-blue-200: #c5caff;
  --color-dramatic-blue-300: #a7a9ff;
  --color-dramatic-blue-400: #888cff;
  --color-dramatic-blue-500: #716bff;
  --color-dramatic-blue-600: #5f5cdd;
  --color-dramatic-blue-700: #4c49b2;
  --color-dramatic-blue-800: #343686;
  --color-dramatic-blue-900: #23255f;
  --color-dramatic-blue-950: #131241;
}

SCSS

$dramatic-blue: #2e0099;
$dramatic-blue-rgb: 46, 0, 153;
$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);
}