#7D6C0B

CSS

:root {
  --muddy-brown: #7d6c0b;
  --muddy-brown-rgb: 125 108 11;
  --muddy-brown-oklch: oklch(0.532 0.106 97.8);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(51 84% 27%);
  border-color: oklch(0.532 0.106 97.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7d6c0b;
  --color-muddy-brown-50: #fcf6d4;
  --color-muddy-brown-100: #f0e9c1;
  --color-muddy-brown-200: #dfd6a1;
  --color-muddy-brown-300: #c4b978;
  --color-muddy-brown-400: #af9f51;
  --color-muddy-brown-500: #998621;
  --color-muddy-brown-600: #82721f;
  --color-muddy-brown-700: #685b19;
  --color-muddy-brown-800: #4d420f;
  --color-muddy-brown-900: #362d09;
  --color-muddy-brown-950: #211a00;
}

SCSS

$muddy-brown: #7d6c0b;
$muddy-brown-rgb: 125, 108, 11;
$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);
}