#776965

CSS

:root {
  --acoustic-brown: #776965;
  --acoustic-brown-rgb: 119 105 101;
  --acoustic-brown-oklch: oklch(0.533 0.019 36.5);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(13 8% 43%);
  border-color: oklch(0.533 0.019 36.5);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #776965;
  --color-acoustic-brown-50: #faf3f1;
  --color-acoustic-brown-100: #eee6e3;
  --color-acoustic-brown-200: #dcd2ce;
  --color-acoustic-brown-300: #c1b4b0;
  --color-acoustic-brown-400: #a99b97;
  --color-acoustic-brown-500: #92827e;
  --color-acoustic-brown-600: #7c6e6a;
  --color-acoustic-brown-700: #635855;
  --color-acoustic-brown-800: #49403e;
  --color-acoustic-brown-900: #322c2b;
  --color-acoustic-brown-950: #1e1918;
}

SCSS

$acoustic-brown: #776965;
$acoustic-brown-rgb: 119, 105, 101;
$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);
}