#E31B4D

CSS

:root {
  --cosmic-red: #e31b4d;
  --cosmic-red-rgb: 227 27 77;
  --cosmic-red-oklch: oklch(0.589 0.225 16);
}

.element {
  color: var(--cosmic-red);
  background-color: hsl(345 79% 50%);
  border-color: oklch(0.589 0.225 16);
}

Tailwind CSS v4

@theme {
  --color-cosmic-red: #e31b4d;
  --color-cosmic-red-50: #ffdcdd;
  --color-cosmic-red-100: #ffc9cc;
  --color-cosmic-red-200: #ffabb0;
  --color-cosmic-red-300: #ff818b;
  --color-cosmic-red-400: #ff5570;
  --color-cosmic-red-500: #f70350;
  --color-cosmic-red-600: #d01145;
  --color-cosmic-red-700: #a81036;
  --color-cosmic-red-800: #7d082a;
  --color-cosmic-red-900: #59061c;
  --color-cosmic-red-950: #3b000c;
}

SCSS

$cosmic-red: #e31b4d;
$cosmic-red-rgb: 227, 27, 77;
$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);
}