#D73835

CSS

:root {
  --red-handed: #d73835;
  --red-handed-rgb: 215 56 53;
  --red-handed-oklch: oklch(0.583 0.196 26.6);
}

.element {
  color: var(--red-handed);
  background-color: hsl(1 67% 53%);
  border-color: oklch(0.583 0.196 26.6);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #d73835;
  --color-red-handed-50: #ffe1d5;
  --color-red-handed-100: #ffcfc3;
  --color-red-handed-200: #ffb3a4;
  --color-red-handed-300: #ff8c7c;
  --color-red-handed-400: #fd665c;
  --color-red-handed-500: #ec3837;
  --color-red-handed-600: #c73230;
  --color-red-handed-700: #a02826;
  --color-red-handed-800: #781b1d;
  --color-red-handed-900: #551213;
  --color-red-handed-950: #390305;
}

SCSS

$red-handed: #d73835;
$red-handed-rgb: 215, 56, 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);
}