#7A6864

CSS

:root {
  --acoustic-brown: #7a6864;
  --acoustic-brown-rgb: 122 104 100;
  --acoustic-brown-oklch: oklch(0.533 0.024 32.6);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(11 10% 44%);
  border-color: oklch(0.533 0.024 32.6);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #7a6864;
  --color-acoustic-brown-50: #fcf3f1;
  --color-acoustic-brown-100: #f0e5e3;
  --color-acoustic-brown-200: #ded1cd;
  --color-acoustic-brown-300: #c3b3af;
  --color-acoustic-brown-400: #ac9a96;
  --color-acoustic-brown-500: #95817c;
  --color-acoustic-brown-600: #7e6d69;
  --color-acoustic-brown-700: #655754;
  --color-acoustic-brown-800: #4a3f3d;
  --color-acoustic-brown-900: #342c2a;
  --color-acoustic-brown-950: #1f1918;
}

SCSS

$acoustic-brown: #7a6864;
$acoustic-brown-rgb: 122, 104, 100;
$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);
}