#C24E56

CSS

:root {
  --autumn-fire: #c24e56;
  --autumn-fire-rgb: 194 78 86;
  --autumn-fire-oklch: oklch(0.579 0.149 18.9);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(356 49% 53%);
  border-color: oklch(0.579 0.149 18.9);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c24e56;
  --color-autumn-fire-50: #ffe5e3;
  --color-autumn-fire-100: #ffd5d3;
  --color-autumn-fire-200: #ffbbb9;
  --color-autumn-fire-300: #fa9896;
  --color-autumn-fire-400: #e9777b;
  --color-autumn-fire-500: #d7545e;
  --color-autumn-fire-600: #b54850;
  --color-autumn-fire-700: #923a40;
  --color-autumn-fire-800: #6c292f;
  --color-autumn-fire-900: #4c1b20;
  --color-autumn-fire-950: #320b10;
}

SCSS

$autumn-fire: #c24e56;
$autumn-fire-rgb: 194, 78, 86;
$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);
}