#D0243A

CSS

:root {
  --sovereign-red: #d0243a;
  --sovereign-red-rgb: 208 36 58;
  --sovereign-red-oklch: oklch(0.556 0.204 21.3);
}

.element {
  color: var(--sovereign-red);
  background-color: hsl(352 70% 48%);
  border-color: oklch(0.556 0.204 21.3);
}

Tailwind CSS v4

@theme {
  --color-sovereign-red: #d0243a;
  --color-sovereign-red-50: #ffdfda;
  --color-sovereign-red-100: #ffcdc8;
  --color-sovereign-red-200: #ffb0ab;
  --color-sovereign-red-300: #ff8985;
  --color-sovereign-red-400: #ff6167;
  --color-sovereign-red-500: #ef2e45;
  --color-sovereign-red-600: #ca2b3c;
  --color-sovereign-red-700: #a2222f;
  --color-sovereign-red-800: #791624;
  --color-sovereign-red-900: #560f18;
  --color-sovereign-red-950: #390109;
}

SCSS

$sovereign-red: #d0243a;
$sovereign-red-rgb: 208, 36, 58;
$sovereign-red-light: mix(#fff, $sovereign-red, 20%);
$sovereign-red-dark: mix(#000, $sovereign-red, 20%);

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