Fire Engine

CSS

:root {
  --fire-engine: #fe0002;
  --fire-engine-rgb: 254 0 2;
  --fire-engine-oklch: oklch(0.626 0.257 29.1);
}

.element {
  color: var(--fire-engine);
  background-color: hsl(360 100% 50%);
  border-color: oklch(0.626 0.257 29.1);
}

Tailwind CSS v4

@theme {
  --color-fire-engine: #fe0002;
  --color-fire-engine-50: #ffdac8;
  --color-fire-engine-100: #ffc7b3;
  --color-fire-engine-200: #ffa78f;
  --color-fire-engine-300: #ff7a60;
  --color-fire-engine-400: #ff4536;
  --color-fire-engine-500: #ff0000;
  --color-fire-engine-600: #dd0000;
  --color-fire-engine-700: #b20000;
  --color-fire-engine-800: #850000;
  --color-fire-engine-900: #5f0001;
  --color-fire-engine-950: #400000;
}

SCSS

$fire-engine: #fe0002;
$fire-engine-rgb: 254, 0, 2;
$fire-engine-light: mix(#fff, $fire-engine, 20%);
$fire-engine-dark: mix(#000, $fire-engine, 20%);

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