#7B6768

CSS

:root {
  --acoustic-brown: #7b6768;
  --acoustic-brown-rgb: 123 103 104;
  --acoustic-brown-oklch: oklch(0.533 0.026 14.6);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(357 9% 44%);
  border-color: oklch(0.533 0.026 14.6);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #7b6768;
  --color-acoustic-brown-50: #fcf2f2;
  --color-acoustic-brown-100: #f0e5e5;
  --color-acoustic-brown-200: #dfd0d0;
  --color-acoustic-brown-300: #c4b2b3;
  --color-acoustic-brown-400: #ad999a;
  --color-acoustic-brown-500: #968081;
  --color-acoustic-brown-600: #7f6c6d;
  --color-acoustic-brown-700: #665657;
  --color-acoustic-brown-800: #4b3f40;
  --color-acoustic-brown-900: #342b2c;
  --color-acoustic-brown-950: #1f1919;
}

SCSS

$acoustic-brown: #7b6768;
$acoustic-brown-rgb: 123, 103, 104;
$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);
}