#31008E

CSS

:root {
  --dramatic-blue: #31008e;
  --dramatic-blue-rgb: 49 0 142;
  --dramatic-blue-oklch: oklch(0.322 0.19 283);
}

.element {
  color: var(--dramatic-blue);
  background-color: hsl(261 100% 28%);
  border-color: oklch(0.322 0.19 283);
}

Tailwind CSS v4

@theme {
  --color-dramatic-blue: #31008e;
  --color-dramatic-blue-50: #efeeff;
  --color-dramatic-blue-100: #e1e0ff;
  --color-dramatic-blue-200: #ccc9ff;
  --color-dramatic-blue-300: #aea8ff;
  --color-dramatic-blue-400: #918bff;
  --color-dramatic-blue-500: #7a6bfd;
  --color-dramatic-blue-600: #675cd6;
  --color-dramatic-blue-700: #5249ac;
  --color-dramatic-blue-800: #393681;
  --color-dramatic-blue-900: #27255c;
  --color-dramatic-blue-950: #16123e;
}

SCSS

$dramatic-blue: #31008e;
$dramatic-blue-rgb: 49, 0, 142;
$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);
}