#C9484E

CSS

:root {
  --autumn-fire: #c9484e;
  --autumn-fire-rgb: 201 72 78;
  --autumn-fire-oklch: oklch(0.58 0.164 21.2);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(357 54% 54%);
  border-color: oklch(0.58 0.164 21.2);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c9484e;
  --color-autumn-fire-50: #ffe4df;
  --color-autumn-fire-100: #ffd3ce;
  --color-autumn-fire-200: #ffb8b3;
  --color-autumn-fire-300: #ff948f;
  --color-autumn-fire-400: #f07273;
  --color-autumn-fire-500: #de4d54;
  --color-autumn-fire-600: #bb4248;
  --color-autumn-fire-700: #973539;
  --color-autumn-fire-800: #70252b;
  --color-autumn-fire-900: #4f191d;
  --color-autumn-fire-950: #34080d;
}

SCSS

$autumn-fire: #c9484e;
$autumn-fire-rgb: 201, 72, 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);
}