#C05055

CSS

:root {
  --autumn-fire: #c05055;
  --autumn-fire-rgb: 192 80 85;
  --autumn-fire-oklch: oklch(0.578 0.144 20.1);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(357 47% 53%);
  border-color: oklch(0.578 0.144 20.1);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c05055;
  --color-autumn-fire-50: #ffe6e3;
  --color-autumn-fire-100: #ffd6d2;
  --color-autumn-fire-200: #ffbcb8;
  --color-autumn-fire-300: #f99996;
  --color-autumn-fire-400: #e7787a;
  --color-autumn-fire-500: #d5575d;
  --color-autumn-fire-600: #b44a4f;
  --color-autumn-fire-700: #903b3f;
  --color-autumn-fire-800: #6b2a2f;
  --color-autumn-fire-900: #4c1c20;
  --color-autumn-fire-950: #320c0f;
}

SCSS

$autumn-fire: #c05055;
$autumn-fire-rgb: 192, 80, 85;
$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);
}