#83716C

CSS

:root {
  --acoustic-brown: #83716c;
  --acoustic-brown-rgb: 131 113 108;
  --acoustic-brown-oklch: oklch(0.564 0.024 36);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(13 10% 47%);
  border-color: oklch(0.564 0.024 36);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #83716c;
  --color-acoustic-brown-50: #fcf3f0;
  --color-acoustic-brown-100: #f0e5e2;
  --color-acoustic-brown-200: #ded1cd;
  --color-acoustic-brown-300: #c3b3af;
  --color-acoustic-brown-400: #ac9a95;
  --color-acoustic-brown-500: #95817b;
  --color-acoustic-brown-600: #7e6d68;
  --color-acoustic-brown-700: #655753;
  --color-acoustic-brown-800: #4a403d;
  --color-acoustic-brown-900: #342c2a;
  --color-acoustic-brown-950: #1f1917;
}

SCSS

$acoustic-brown: #83716c;
$acoustic-brown-rgb: 131, 113, 108;
$acoustic-brown-light: mix(#fff, $acoustic-brown, 20%);
$acoustic-brown-dark: mix(#000, $acoustic-brown, 20%);

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