#D93535

CSS

:root {
  --red-handed: #d93535;
  --red-handed-rgb: 217 53 53;
  --red-handed-oklch: oklch(0.584 0.201 26);
}

.element {
  color: var(--red-handed);
  background-color: hsl(0 68% 53%);
  border-color: oklch(0.584 0.201 26);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #d93535;
  --color-red-handed-50: #ffe0d5;
  --color-red-handed-100: #ffcfc3;
  --color-red-handed-200: #ffb2a4;
  --color-red-handed-300: #ff8b7c;
  --color-red-handed-400: #ff645c;
  --color-red-handed-500: #ee3436;
  --color-red-handed-600: #c92f2f;
  --color-red-handed-700: #a22625;
  --color-red-handed-800: #79191d;
  --color-red-handed-900: #561013;
  --color-red-handed-950: #390205;
}

SCSS

$red-handed: #d93535;
$red-handed-rgb: 217, 53, 53;
$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);
}