#8C5130

CSS

:root {
  --hello-fall: #8c5130;
  --hello-fall-rgb: 140 81 48;
  --hello-fall-oklch: oklch(0.497 0.092 48.8);
}

.element {
  color: var(--hello-fall);
  background-color: hsl(22 49% 37%);
  border-color: oklch(0.497 0.092 48.8);
}

Tailwind CSS v4

@theme {
  --color-hello-fall: #8c5130;
  --color-hello-fall-50: #ffeede;
  --color-hello-fall-100: #ffe0cd;
  --color-hello-fall-200: #f6cab1;
  --color-hello-fall-300: #deaa8d;
  --color-hello-fall-400: #cb8e6e;
  --color-hello-fall-500: #b7734d;
  --color-hello-fall-600: #9b6142;
  --color-hello-fall-700: #7c4e35;
  --color-hello-fall-800: #5c3826;
  --color-hello-fall-900: #412619;
  --color-hello-fall-950: #29140a;
}

SCSS

$hello-fall: #8c5130;
$hello-fall-rgb: 140, 81, 48;
$hello-fall-light: mix(#fff, $hello-fall, 20%);
$hello-fall-dark: mix(#000, $hello-fall, 20%);

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