#7F6B17

CSS

:root {
  --muddy-brown: #7f6b17;
  --muddy-brown-rgb: 127 107 23;
  --muddy-brown-oklch: oklch(0.532 0.101 94.7);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(48 69% 29%);
  border-color: oklch(0.532 0.101 94.7);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7f6b17;
  --color-muddy-brown-50: #fdf6d6;
  --color-muddy-brown-100: #f1e9c3;
  --color-muddy-brown-200: #e0d5a4;
  --color-muddy-brown-300: #c6b87c;
  --color-muddy-brown-400: #b19e55;
  --color-muddy-brown-500: #9b852a;
  --color-muddy-brown-600: #837026;
  --color-muddy-brown-700: #695a1e;
  --color-muddy-brown-800: #4e4113;
  --color-muddy-brown-900: #372d0c;
  --color-muddy-brown-950: #221a01;
}

SCSS

$muddy-brown: #7f6b17;
$muddy-brown-rgb: 127, 107, 23;
$muddy-brown-light: mix(#fff, $muddy-brown, 20%);
$muddy-brown-dark: mix(#000, $muddy-brown, 20%);

.element {
  color: $muddy-brown;
  box-shadow: 0 0 0 2px rgba($muddy-brown, 0.35);
}