#716B6B

CSS

:root {
  --acoustic-brown: #716b6b;
  --acoustic-brown-rgb: 113 107 107;
  --acoustic-brown-oklch: oklch(0.533 0.008 17.4);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(0 3% 43%);
  border-color: oklch(0.533 0.008 17.4);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #716b6b;
  --color-acoustic-brown-50: #f7f4f4;
  --color-acoustic-brown-100: #eae7e7;
  --color-acoustic-brown-200: #d7d3d3;
  --color-acoustic-brown-300: #bbb6b6;
  --color-acoustic-brown-400: #a39d9d;
  --color-acoustic-brown-500: #8b8484;
  --color-acoustic-brown-600: #767070;
  --color-acoustic-brown-700: #5e5959;
  --color-acoustic-brown-800: #454141;
  --color-acoustic-brown-900: #302d2d;
  --color-acoustic-brown-950: #1c1a1a;
}

SCSS

$acoustic-brown: #716b6b;
$acoustic-brown-rgb: 113, 107, 107;
$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);
}