#F43F5E

CSS

:root {
  --radical-red: #f43f5e;
  --radical-red-rgb: 244 63 94;
  --radical-red-oklch: oklch(0.645 0.215 16.4);
}

.element {
  color: var(--radical-red);
  background-color: hsl(350 89% 60%);
  border-color: oklch(0.645 0.215 16.4);
}

Tailwind CSS v4

@theme {
  --color-radical-red: #f43f5e;
  --color-radical-red-50: #ffdddd;
  --color-radical-red-100: #ffcbcc;
  --color-radical-red-200: #ffadb1;
  --color-radical-red-300: #ff848c;
  --color-radical-red-400: #ff5a71;
  --color-radical-red-500: #f31d51;
  --color-radical-red-600: #cd1e46;
  --color-radical-red-700: #a51937;
  --color-radical-red-800: #7b0f2a;
  --color-radical-red-900: #570a1c;
  --color-radical-red-950: #3a000d;
}

SCSS

$radical-red: #f43f5e;
$radical-red-rgb: 244, 63, 94;
$radical-red-light: mix(#fff, $radical-red, 20%);
$radical-red-dark: mix(#000, $radical-red, 20%);

.element {
  color: $radical-red;
  box-shadow: 0 0 0 2px rgba($radical-red, 0.35);
}