#D63652

CSS

:root {
  --cosmic-red: #d63652;
  --cosmic-red-rgb: 214 54 82;
  --cosmic-red-oklch: oklch(0.584 0.195 16.2);
}

.element {
  color: var(--cosmic-red);
  background-color: hsl(350 66% 53%);
  border-color: oklch(0.584 0.195 16.2);
}

Tailwind CSS v4

@theme {
  --color-cosmic-red: #d63652;
  --color-cosmic-red-50: #ffdfe0;
  --color-cosmic-red-100: #ffcecf;
  --color-cosmic-red-200: #ffb1b4;
  --color-cosmic-red-300: #ff8a91;
  --color-cosmic-red-400: #fc6476;
  --color-cosmic-red-500: #ea3558;
  --color-cosmic-red-600: #c6304b;
  --color-cosmic-red-700: #9f263b;
  --color-cosmic-red-800: #771a2d;
  --color-cosmic-red-900: #54111e;
  --color-cosmic-red-950: #38020e;
}

SCSS

$cosmic-red: #d63652;
$cosmic-red-rgb: 214, 54, 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);
}