#756A69

CSS

:root {
  --acoustic-brown: #756a69;
  --acoustic-brown-rgb: 117 106 105;
  --acoustic-brown-oklch: oklch(0.534 0.014 23.9);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(5 5% 44%);
  border-color: oklch(0.534 0.014 23.9);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #756a69;
  --color-acoustic-brown-50: #f9f4f3;
  --color-acoustic-brown-100: #ece6e5;
  --color-acoustic-brown-200: #dad2d1;
  --color-acoustic-brown-300: #beb5b4;
  --color-acoustic-brown-400: #a79b9a;
  --color-acoustic-brown-500: #8f8382;
  --color-acoustic-brown-600: #796f6e;
  --color-acoustic-brown-700: #615858;
  --color-acoustic-brown-800: #474140;
  --color-acoustic-brown-900: #312c2c;
  --color-acoustic-brown-950: #1d1a19;
}

SCSS

$acoustic-brown: #756a69;
$acoustic-brown-rgb: 117, 106, 105;
$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);
}