#E91C14

CSS

:root {
  --breath-of-fire: #e91c14;
  --breath-of-fire-rgb: 233 28 20;
  --breath-of-fire-oklch: oklch(0.595 0.233 29.1);
}

.element {
  color: var(--breath-of-fire);
  background-color: hsl(2 84% 50%);
  border-color: oklch(0.595 0.233 29.1);
}

Tailwind CSS v4

@theme {
  --color-breath-of-fire: #e91c14;
  --color-breath-of-fire-50: #ffddcd;
  --color-breath-of-fire-100: #ffcbb8;
  --color-breath-of-fire-200: #ffac96;
  --color-breath-of-fire-300: #ff826a;
  --color-breath-of-fire-400: #ff5544;
  --color-breath-of-fire-500: #fb0000;
  --color-breath-of-fire-600: #d40d09;
  --color-breath-of-fire-700: #ab0e09;
  --color-breath-of-fire-800: #80050b;
  --color-breath-of-fire-900: #5b0507;
  --color-breath-of-fire-950: #3d0000;
}

SCSS

$breath-of-fire: #e91c14;
$breath-of-fire-rgb: 233, 28, 20;
$breath-of-fire-light: mix(#fff, $breath-of-fire, 20%);
$breath-of-fire-dark: mix(#000, $breath-of-fire, 20%);

.element {
  color: $breath-of-fire;
  box-shadow: 0 0 0 2px rgba($breath-of-fire, 0.35);
}