#7C6C15

CSS

:root {
  --muddy-brown: #7c6c15;
  --muddy-brown-rgb: 124 108 21;
  --muddy-brown-oklch: oklch(0.531 0.102 98);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(51 71% 28%);
  border-color: oklch(0.531 0.102 98);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7c6c15;
  --color-muddy-brown-50: #fcf6d5;
  --color-muddy-brown-100: #efe9c3;
  --color-muddy-brown-200: #ded6a4;
  --color-muddy-brown-300: #c3b97b;
  --color-muddy-brown-400: #ae9f55;
  --color-muddy-brown-500: #988629;
  --color-muddy-brown-600: #817225;
  --color-muddy-brown-700: #675b1d;
  --color-muddy-brown-800: #4d4212;
  --color-muddy-brown-900: #352e0b;
  --color-muddy-brown-950: #211a01;
}

SCSS

$muddy-brown: #7c6c15;
$muddy-brown-rgb: 124, 108, 21;
$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);
}