#E02731

CSS

:root {
  --red-handed: #e02731;
  --red-handed-rgb: 224 39 49;
  --red-handed-oklch: oklch(0.586 0.217 25.1);
}

.element {
  color: var(--red-handed);
  background-color: hsl(357 75% 52%);
  border-color: oklch(0.586 0.217 25.1);
}

Tailwind CSS v4

@theme {
  --color-red-handed: #e02731;
  --color-red-handed-50: #ffded4;
  --color-red-handed-100: #ffccc1;
  --color-red-handed-200: #ffafa1;
  --color-red-handed-300: #ff8679;
  --color-red-handed-400: #ff5c59;
  --color-red-handed-500: #f51f31;
  --color-red-handed-600: #cf202b;
  --color-red-handed-700: #a61b22;
  --color-red-handed-800: #7d101b;
  --color-red-handed-900: #580b11;
  --color-red-handed-950: #3b0004;
}

SCSS

$red-handed: #e02731;
$red-handed-rgb: 224, 39, 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);
}