#E12531

CSS

:root {
  --red-handed: #e12531;
  --red-handed-rgb: 225 37 49;
  --red-handed-oklch: oklch(0.587 0.219 24.9);
}

.element {
  color: var(--red-handed);
  background-color: hsl(356 76% 51%);
  border-color: oklch(0.587 0.219 24.9);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #e12531;
  --color-red-handed-50: #ffded4;
  --color-red-handed-100: #ffccc1;
  --color-red-handed-200: #ffaea1;
  --color-red-handed-300: #ff8579;
  --color-red-handed-400: #ff5a58;
  --color-red-handed-500: #f61c31;
  --color-red-handed-600: #cf1e2b;
  --color-red-handed-700: #a71922;
  --color-red-handed-800: #7d0e1b;
  --color-red-handed-900: #580a11;
  --color-red-handed-950: #3b0004;
}

SCSS

$red-handed: #e12531;
$red-handed-rgb: 225, 37, 49;
$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);
}