#7D6B18

CSS

:root {
  --muddy-brown: #7d6b18;
  --muddy-brown-rgb: 125 107 24;
  --muddy-brown-oklch: oklch(0.53 0.1 96.1);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(49 68% 29%);
  border-color: oklch(0.53 0.1 96.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7d6b18;
  --color-muddy-brown-50: #fcf6d6;
  --color-muddy-brown-100: #f0e9c3;
  --color-muddy-brown-200: #dfd5a5;
  --color-muddy-brown-300: #c5b87c;
  --color-muddy-brown-400: #b09e56;
  --color-muddy-brown-500: #9a852b;
  --color-muddy-brown-600: #827127;
  --color-muddy-brown-700: #685a1f;
  --color-muddy-brown-800: #4e4214;
  --color-muddy-brown-900: #362d0d;
  --color-muddy-brown-950: #211a01;
}

SCSS

$muddy-brown: #7d6b18;
$muddy-brown-rgb: 125, 107, 24;
$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);
}