#7D5752

CSS

:root {
  --root-beer: #7d5752;
  --root-beer-rgb: 125 87 82;
  --root-beer-oklch: oklch(0.496 0.052 27.4);
}

.element {
  color: var(--root-beer);
  background-color: hsl(7 21% 41%);
  border-color: oklch(0.496 0.052 27.4);
}

Tailwind CSS v4

@theme {
  --color-root-beer: #7d5752;
  --color-root-beer-50: #fff0ed;
  --color-root-beer-100: #f9e2de;
  --color-root-beer-200: #eacdc8;
  --color-root-beer-300: #d1aea8;
  --color-root-beer-400: #bb938e;
  --color-root-beer-500: #a67973;
  --color-root-beer-600: #8c6762;
  --color-root-beer-700: #70524e;
  --color-root-beer-800: #533c39;
  --color-root-beer-900: #3a2927;
  --color-root-beer-950: #241715;
}

SCSS

$root-beer: #7d5752;
$root-beer-rgb: 125, 87, 82;
$root-beer-light: mix(#fff, $root-beer, 20%);
$root-beer-dark: mix(#000, $root-beer, 20%);

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