#CF273C

CSS

:root {
  --sovereign-red: #cf273c;
  --sovereign-red-rgb: 207 39 60;
  --sovereign-red-oklch: oklch(0.557 0.201 21);
}

.element {
  color: var(--sovereign-red);
  background-color: hsl(353 68% 48%);
  border-color: oklch(0.557 0.201 21);
}

Tailwind CSS v4

@theme {
  --color-sovereign-red: #cf273c;
  --color-sovereign-red-50: #ffdfda;
  --color-sovereign-red-100: #ffcec8;
  --color-sovereign-red-200: #ffb1ac;
  --color-sovereign-red-300: #ff8a86;
  --color-sovereign-red-400: #ff6269;
  --color-sovereign-red-500: #ee3148;
  --color-sovereign-red-600: #c92d3d;
  --color-sovereign-red-700: #a22431;
  --color-sovereign-red-800: #791825;
  --color-sovereign-red-900: #551019;
  --color-sovereign-red-950: #39010a;
}

SCSS

$sovereign-red: #cf273c;
$sovereign-red-rgb: 207, 39, 60;
$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);
}