#D93538

CSS

:root {
  --red-handed: #d93538;
  --red-handed-rgb: 217 53 56;
  --red-handed-oklch: oklch(0.584 0.2 25.2);
}

.element {
  color: var(--red-handed);
  background-color: hsl(359 68% 53%);
  border-color: oklch(0.584 0.2 25.2);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #d93538;
  --color-red-handed-50: #ffe0d6;
  --color-red-handed-100: #ffcfc4;
  --color-red-handed-200: #ffb2a5;
  --color-red-handed-300: #ff8b7e;
  --color-red-handed-400: #ff645f;
  --color-red-handed-500: #ee343a;
  --color-red-handed-600: #c92f32;
  --color-red-handed-700: #a22628;
  --color-red-handed-800: #79191e;
  --color-red-handed-900: #551014;
  --color-red-handed-950: #390206;
}

SCSS

$red-handed: #d93538;
$red-handed-rgb: 217, 53, 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);
}