#DB3138

CSS

:root {
  --red-handed: #db3138;
  --red-handed-rgb: 219 49 56;
  --red-handed-oklch: oklch(0.585 0.205 24.5);
}

.element {
  color: var(--red-handed);
  background-color: hsl(358 70% 53%);
  border-color: oklch(0.585 0.205 24.5);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #db3138;
  --color-red-handed-50: #ffdfd6;
  --color-red-handed-100: #ffcec4;
  --color-red-handed-200: #ffb1a5;
  --color-red-handed-300: #ff897e;
  --color-red-handed-400: #ff615e;
  --color-red-handed-500: #f02e3a;
  --color-red-handed-600: #cb2b32;
  --color-red-handed-700: #a32328;
  --color-red-handed-800: #7a161e;
  --color-red-handed-900: #560f14;
  --color-red-handed-950: #3a0106;
}

SCSS

$red-handed: #db3138;
$red-handed-rgb: 219, 49, 56;
$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);
}