#DA323B

CSS

:root {
  --red-handed: #da323b;
  --red-handed-rgb: 218 50 59;
  --red-handed-oklch: oklch(0.584 0.203 23.8);
}

.element {
  color: var(--red-handed);
  background-color: hsl(357 69% 53%);
  border-color: oklch(0.584 0.203 23.8);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #da323b;
  --color-red-handed-50: #ffdfd7;
  --color-red-handed-100: #ffcec5;
  --color-red-handed-200: #ffb1a7;
  --color-red-handed-300: #ff8a80;
  --color-red-handed-400: #ff6261;
  --color-red-handed-500: #ef303d;
  --color-red-handed-600: #ca2c35;
  --color-red-handed-700: #a2232a;
  --color-red-handed-800: #791720;
  --color-red-handed-900: #560f15;
  --color-red-handed-950: #390107;
}

SCSS

$red-handed: #da323b;
$red-handed-rgb: 218, 50, 59;
$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);
}