#736A6D

CSS

:root {
  --acoustic-brown: #736a6d;
  --acoustic-brown-rgb: 115 106 109;
  --acoustic-brown-oklch: oklch(0.534 0.012 355.2);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(340 4% 43%);
  border-color: oklch(0.534 0.012 355.2);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #736a6d;
  --color-acoustic-brown-50: #f8f4f5;
  --color-acoustic-brown-100: #ebe6e8;
  --color-acoustic-brown-200: #d9d2d4;
  --color-acoustic-brown-300: #bdb5b7;
  --color-acoustic-brown-400: #a59c9f;
  --color-acoustic-brown-500: #8d8386;
  --color-acoustic-brown-600: #776f72;
  --color-acoustic-brown-700: #60595b;
  --color-acoustic-brown-800: #464143;
  --color-acoustic-brown-900: #302d2e;
  --color-acoustic-brown-950: #1d1a1b;
}

SCSS

$acoustic-brown: #736a6d;
$acoustic-brown-rgb: 115, 106, 109;
$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);
}