#E1002D

CSS

:root {
  --rare-red: #e1002d;
  --rare-red-rgb: 225 0 45;
  --rare-red-oklch: oklch(0.574 0.232 23.3);
}

.element {
  color: var(--rare-red);
  background-color: hsl(348 100% 44%);
  border-color: oklch(0.574 0.232 23.3);
}

Tailwind CSS v4

@theme {
  --color-rare-red: #e1002d;
  --color-rare-red-50: #ffdcd3;
  --color-rare-red-100: #ffcac0;
  --color-rare-red-200: #ffaba1;
  --color-rare-red-300: #ff8078;
  --color-rare-red-400: #ff5358;
  --color-rare-red-500: #fb0031;
  --color-rare-red-600: #d4062b;
  --color-rare-red-700: #ab0922;
  --color-rare-red-800: #80031b;
  --color-rare-red-900: #5a0411;
  --color-rare-red-950: #3d0004;
}

SCSS

$rare-red: #e1002d;
$rare-red-rgb: 225, 0, 45;
$rare-red-light: mix(#fff, $rare-red, 20%);
$rare-red-dark: mix(#000, $rare-red, 20%);

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