#DE2B35

CSS

:root {
  --red-handed: #de2b35;
  --red-handed-rgb: 222 43 53;
  --red-handed-oklch: oklch(0.585 0.212 24.5);
}

.element {
  color: var(--red-handed);
  background-color: hsl(357 73% 52%);
  border-color: oklch(0.585 0.212 24.5);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #de2b35;
  --color-red-handed-50: #ffded5;
  --color-red-handed-100: #ffcdc2;
  --color-red-handed-200: #ffafa3;
  --color-red-handed-300: #ff877b;
  --color-red-handed-400: #ff5e5c;
  --color-red-handed-500: #f32636;
  --color-red-handed-600: #cd252f;
  --color-red-handed-700: #a51e25;
  --color-red-handed-800: #7b121d;
  --color-red-handed-900: #570c13;
  --color-red-handed-950: #3a0005;
}

SCSS

$red-handed: #de2b35;
$red-handed-rgb: 222, 43, 53;
$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);
}