#C84E4E

CSS

:root {
  --autumn-fire: #c84e4e;
  --autumn-fire-rgb: 200 78 78;
  --autumn-fire-oklch: oklch(0.586 0.156 23.2);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(0 53% 55%);
  border-color: oklch(0.586 0.156 23.2);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c84e4e;
  --color-autumn-fire-50: #ffe5df;
  --color-autumn-fire-100: #ffd4ce;
  --color-autumn-fire-200: #ffbab2;
  --color-autumn-fire-300: #fd978e;
  --color-autumn-fire-400: #ec7572;
  --color-autumn-fire-500: #da5252;
  --color-autumn-fire-600: #b84646;
  --color-autumn-fire-700: #943838;
  --color-autumn-fire-800: #6e272a;
  --color-autumn-fire-900: #4e1a1c;
  --color-autumn-fire-950: #330a0c;
}

SCSS

$autumn-fire: #c84e4e;
$autumn-fire-rgb: 200, 78, 78;
$autumn-fire-light: mix(#fff, $autumn-fire, 20%);
$autumn-fire-dark: mix(#000, $autumn-fire, 20%);

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