#7D6B1B

CSS

:root {
  --muddy-brown: #7d6b1b;
  --muddy-brown-rgb: 125 107 27;
  --muddy-brown-oklch: oklch(0.53 0.098 95.8);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(49 64% 30%);
  border-color: oklch(0.53 0.098 95.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7d6b1b;
  --color-muddy-brown-50: #fcf6d6;
  --color-muddy-brown-100: #f0e9c4;
  --color-muddy-brown-200: #dfd5a5;
  --color-muddy-brown-300: #c5b87e;
  --color-muddy-brown-400: #b09e58;
  --color-muddy-brown-500: #9a852e;
  --color-muddy-brown-600: #827129;
  --color-muddy-brown-700: #685a20;
  --color-muddy-brown-800: #4e4215;
  --color-muddy-brown-900: #362d0d;
  --color-muddy-brown-950: #211a02;
}

SCSS

$muddy-brown: #7d6b1b;
$muddy-brown-rgb: 125, 107, 27;
$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);
}