#90605B

CSS

:root {
  --root-beer: #90605b;
  --root-beer-rgb: 144 96 91;
  --root-beer-oklch: oklch(0.539 0.064 25.9);
}

.element {
  color: var(--root-beer);
  background-color: hsl(6 23% 46%);
  border-color: oklch(0.539 0.064 25.9);
}

Tailwind CSS v4

@theme {
  --color-root-beer: #90605b;
  --color-root-beer-50: #ffefeb;
  --color-root-beer-100: #fde0dc;
  --color-root-beer-200: #eecbc5;
  --color-root-beer-300: #d6aca5;
  --color-root-beer-400: #c1908b;
  --color-root-beer-500: #ad7670;
  --color-root-beer-600: #92645f;
  --color-root-beer-700: #75504c;
  --color-root-beer-800: #573a38;
  --color-root-beer-900: #3c2826;
  --color-root-beer-950: #261614;
}

SCSS

$root-beer: #90605b;
$root-beer-rgb: 144, 96, 91;
$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);
}