#ED0D0F

CSS

:root {
  --breath-of-fire: #ed0d0f;
  --breath-of-fire-rgb: 237 13 15;
  --breath-of-fire-oklch: oklch(0.597 0.241 28.7);
}

.element {
  color: var(--breath-of-fire);
  background-color: hsl(359 90% 49%);
  border-color: oklch(0.597 0.241 28.7);
}

Tailwind CSS v4

@theme {
  --color-breath-of-fire: #ed0d0f;
  --color-breath-of-fire-50: #ffdccc;
  --color-breath-of-fire-100: #ffcab7;
  --color-breath-of-fire-200: #ffaa94;
  --color-breath-of-fire-300: #ff7f67;
  --color-breath-of-fire-400: #ff5042;
  --color-breath-of-fire-500: #ff0000;
  --color-breath-of-fire-600: #d70001;
  --color-breath-of-fire-700: #ad0004;
  --color-breath-of-fire-800: #820009;
  --color-breath-of-fire-900: #5c0206;
  --color-breath-of-fire-950: #3e0000;
}

SCSS

$breath-of-fire: #ed0d0f;
$breath-of-fire-rgb: 237, 13, 15;
$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);
}