#DE2A3B

CSS

:root {
  --red-handed: #de2a3b;
  --red-handed-rgb: 222 42 59;
  --red-handed-oklch: oklch(0.586 0.213 22.7);
}

.element {
  color: var(--red-handed);
  background-color: hsl(354 73% 52%);
  border-color: oklch(0.586 0.213 22.7);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #de2a3b;
  --color-red-handed-50: #ffded7;
  --color-red-handed-100: #ffccc4;
  --color-red-handed-200: #ffafa6;
  --color-red-handed-300: #ff867f;
  --color-red-handed-400: #ff5d61;
  --color-red-handed-500: #f3243d;
  --color-red-handed-600: #cd2435;
  --color-red-handed-700: #a51d2a;
  --color-red-handed-800: #7b1220;
  --color-red-handed-900: #570c15;
  --color-red-handed-950: #3a0007;
}

SCSS

$red-handed: #de2a3b;
$red-handed-rgb: 222, 42, 59;
$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);
}