#DE2D33

CSS

:root {
  --red-handed: #de2d33;
  --red-handed-rgb: 222 45 51;
  --red-handed-oklch: oklch(0.587 0.211 25.3);
}

.element {
  color: var(--red-handed);
  background-color: hsl(358 73% 52%);
  border-color: oklch(0.587 0.211 25.3);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #de2d33;
  --color-red-handed-50: #ffdfd4;
  --color-red-handed-100: #ffcdc1;
  --color-red-handed-200: #ffb0a2;
  --color-red-handed-300: #ff887a;
  --color-red-handed-400: #ff5f5a;
  --color-red-handed-500: #f22833;
  --color-red-handed-600: #cd262d;
  --color-red-handed-700: #a51f23;
  --color-red-handed-800: #7b131c;
  --color-red-handed-900: #570d12;
  --color-red-handed-950: #3a0005;
}

SCSS

$red-handed: #de2d33;
$red-handed-rgb: 222, 45, 51;
$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);
}