#DC3034

CSS

:root {
  --red-handed: #dc3034;
  --red-handed-rgb: 220 48 52;
  --red-handed-oklch: oklch(0.585 0.207 25.5);
}

.element {
  color: var(--red-handed);
  background-color: hsl(359 71% 53%);
  border-color: oklch(0.585 0.207 25.5);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #dc3034;
  --color-red-handed-50: #ffdfd5;
  --color-red-handed-100: #ffcec2;
  --color-red-handed-200: #ffb1a3;
  --color-red-handed-300: #ff897b;
  --color-red-handed-400: #ff615b;
  --color-red-handed-500: #f12d35;
  --color-red-handed-600: #cb2a2e;
  --color-red-handed-700: #a42224;
  --color-red-handed-800: #7a151c;
  --color-red-handed-900: #570e12;
  --color-red-handed-950: #3a0005;
}

SCSS

$red-handed: #dc3034;
$red-handed-rgb: 220, 48, 52;
$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);
}