#E31E37

CSS

:root {
  --red-handed: #e31e37;
  --red-handed-rgb: 227 30 55;
  --red-handed-oklch: oklch(0.587 0.224 22.7);
}

.element {
  color: var(--red-handed);
  background-color: hsl(352 78% 50%);
  border-color: oklch(0.587 0.224 22.7);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #e31e37;
  --color-red-handed-50: #ffddd5;
  --color-red-handed-100: #ffcbc2;
  --color-red-handed-200: #ffaca4;
  --color-red-handed-300: #ff837c;
  --color-red-handed-400: #ff575d;
  --color-red-handed-500: #f80e38;
  --color-red-handed-600: #d11630;
  --color-red-handed-700: #a81326;
  --color-red-handed-800: #7e0a1e;
  --color-red-handed-900: #590713;
  --color-red-handed-950: #3c0006;
}

SCSS

$red-handed: #e31e37;
$red-handed-rgb: 227, 30, 55;
$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);
}