#796866

CSS

:root {
  --acoustic-brown: #796866;
  --acoustic-brown-rgb: 121 104 102;
  --acoustic-brown-oklch: oklch(0.533 0.022 25.8);
}

.element {
  color: var(--acoustic-brown);
  background-color: hsl(6 9% 44%);
  border-color: oklch(0.533 0.022 25.8);
}

Tailwind CSS v4

@theme {
  --color-acoustic-brown: #796866;
  --color-acoustic-brown-50: #fbf3f2;
  --color-acoustic-brown-100: #efe5e4;
  --color-acoustic-brown-200: #ddd1cf;
  --color-acoustic-brown-300: #c2b3b1;
  --color-acoustic-brown-400: #ab9a98;
  --color-acoustic-brown-500: #94817f;
  --color-acoustic-brown-600: #7d6d6b;
  --color-acoustic-brown-700: #645756;
  --color-acoustic-brown-800: #4a403f;
  --color-acoustic-brown-900: #332c2b;
  --color-acoustic-brown-950: #1f1918;
}

SCSS

$acoustic-brown: #796866;
$acoustic-brown-rgb: 121, 104, 102;
$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);
}