#DA3338

CSS

:root {
  --red-handed: #da3338;
  --red-handed-rgb: 218 51 56;
  --red-handed-oklch: oklch(0.585 0.203 24.8);
}

.element {
  color: var(--red-handed);
  background-color: hsl(358 69% 53%);
  border-color: oklch(0.585 0.203 24.8);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #da3338;
  --color-red-handed-50: #ffe0d6;
  --color-red-handed-100: #ffcec4;
  --color-red-handed-200: #ffb1a5;
  --color-red-handed-300: #ff8a7e;
  --color-red-handed-400: #ff625f;
  --color-red-handed-500: #ef313a;
  --color-red-handed-600: #ca2d32;
  --color-red-handed-700: #a22428;
  --color-red-handed-800: #79171e;
  --color-red-handed-900: #561014;
  --color-red-handed-950: #390106;
}

SCSS

$red-handed: #da3338;
$red-handed-rgb: 218, 51, 56;
$red-handed-light: mix(#fff, $red-handed, 20%);
$red-handed-dark: mix(#000, $red-handed, 20%);

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