#DE343A

CSS

:root {
  --red-handed: #de343a;
  --red-handed-rgb: 222 52 58;
  --red-handed-oklch: oklch(0.593 0.206 24.6);
}

.element {
  color: var(--red-handed);
  background-color: hsl(358 72% 54%);
  border-color: oklch(0.593 0.206 24.6);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #de343a;
  --color-red-handed-50: #ffdfd6;
  --color-red-handed-100: #ffcec3;
  --color-red-handed-200: #ffb1a5;
  --color-red-handed-300: #ff897d;
  --color-red-handed-400: #ff615e;
  --color-red-handed-500: #f02e39;
  --color-red-handed-600: #cb2a32;
  --color-red-handed-700: #a32227;
  --color-red-handed-800: #7a161e;
  --color-red-handed-900: #560f14;
  --color-red-handed-950: #3a0106;
}

SCSS

$red-handed: #de343a;
$red-handed-rgb: 222, 52, 58;
$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);
}