#D73452

CSS

:root {
  --cosmic-red: #d73452;
  --cosmic-red-rgb: 215 52 82;
  --cosmic-red-oklch: oklch(0.584 0.198 16);
}

.element {
  color: var(--cosmic-red);
  background-color: hsl(349 67% 52%);
  border-color: oklch(0.584 0.198 16);
}

Tailwind CSS v4

@theme {
  --color-cosmic-red: #d73452;
  --color-cosmic-red-50: #ffdfe0;
  --color-cosmic-red-100: #ffcdcf;
  --color-cosmic-red-200: #ffb1b4;
  --color-cosmic-red-300: #ff8991;
  --color-cosmic-red-400: #fd6276;
  --color-cosmic-red-500: #ec3358;
  --color-cosmic-red-600: #c72e4b;
  --color-cosmic-red-700: #a0253b;
  --color-cosmic-red-800: #77182d;
  --color-cosmic-red-900: #54101e;
  --color-cosmic-red-950: #38020e;
}

SCSS

$cosmic-red: #d73452;
$cosmic-red-rgb: 215, 52, 82;
$cosmic-red-light: mix(#fff, $cosmic-red, 20%);
$cosmic-red-dark: mix(#000, $cosmic-red, 20%);

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