#37008E

CSS

:root {
  --dramatic-blue: #37008e;
  --dramatic-blue-rgb: 55 0 142;
  --dramatic-blue-oklch: oklch(0.328 0.19 286.4);
}

.element {
  color: var(--dramatic-blue);
  background-color: hsl(263 100% 28%);
  border-color: oklch(0.328 0.19 286.4);
}

Tailwind CSS v4

@theme {
  --color-dramatic-blue: #37008e;
  --color-dramatic-blue-50: #f2edff;
  --color-dramatic-blue-100: #e4deff;
  --color-dramatic-blue-200: #d0c7ff;
  --color-dramatic-blue-300: #b4a6ff;
  --color-dramatic-blue-400: #9889ff;
  --color-dramatic-blue-500: #8169fb;
  --color-dramatic-blue-600: #6d59d3;
  --color-dramatic-blue-700: #5747aa;
  --color-dramatic-blue-800: #3d3480;
  --color-dramatic-blue-900: #2a245b;
  --color-dramatic-blue-950: #18123e;
}

SCSS

$dramatic-blue: #37008e;
$dramatic-blue-rgb: 55, 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);
}