#766900

CSS

:root {
  --muddy-brown: #766900;
  --muddy-brown-rgb: 118 105 0;
  --muddy-brown-oklch: oklch(0.517 0.108 100.8);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(53 100% 23%);
  border-color: oklch(0.517 0.108 100.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #766900;
  --color-muddy-brown-50: #faf7d4;
  --color-muddy-brown-100: #eeeac1;
  --color-muddy-brown-200: #dcd7a1;
  --color-muddy-brown-300: #c1ba78;
  --color-muddy-brown-400: #aca050;
  --color-muddy-brown-500: #968820;
  --color-muddy-brown-600: #7f731e;
  --color-muddy-brown-700: #665c18;
  --color-muddy-brown-800: #4c430e;
  --color-muddy-brown-900: #352e09;
  --color-muddy-brown-950: #201b00;
}

SCSS

$muddy-brown: #766900;
$muddy-brown-rgb: 118, 105, 0;
$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);
}