#780000

CSS

:root {
  --liquorice-red: #780000;
  --liquorice-red-rgb: 120 0 0;
  --liquorice-red-oklch: oklch(0.36 0.148 29.2);
}

.element {
  color: var(--liquorice-red);
  background-color: hsl(0 100% 24%);
  border-color: oklch(0.36 0.148 29.2);
}

Tailwind CSS v4

@theme {
  --color-liquorice-red: #780000;
  --color-liquorice-red-50: #ffe6dc;
  --color-liquorice-red-100: #ffd6ca;
  --color-liquorice-red-200: #ffbdae;
  --color-liquorice-red-300: #f99a88;
  --color-liquorice-red-400: #e8796a;
  --color-liquorice-red-500: #d65849;
  --color-liquorice-red-600: #b54b3f;
  --color-liquorice-red-700: #913c32;
  --color-liquorice-red-800: #6c2a25;
  --color-liquorice-red-900: #4c1c18;
  --color-liquorice-red-950: #320c09;
}

SCSS

$liquorice-red: #780000;
$liquorice-red-rgb: 120, 0, 0;
$liquorice-red-light: mix(#fff, $liquorice-red, 20%);
$liquorice-red-dark: mix(#000, $liquorice-red, 20%);

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