#7B6A50

CSS

:root {
  --heavy-brown: #7b6a50;
  --heavy-brown-rgb: 123 106 80;
  --heavy-brown-oklch: oklch(0.533 0.044 78.1);
}

.element {
  color: var(--heavy-brown);
  background-color: hsl(36 21% 40%);
  border-color: oklch(0.533 0.044 78.1);
}

Tailwind CSS v4

@theme {
  --color-heavy-brown: #7b6a50;
  --color-heavy-brown-50: #fcf4e7;
  --color-heavy-brown-100: #f0e7d8;
  --color-heavy-brown-200: #ded3c0;
  --color-heavy-brown-300: #c3b59f;
  --color-heavy-brown-400: #ad9c82;
  --color-heavy-brown-500: #968365;
  --color-heavy-brown-600: #7f6f56;
  --color-heavy-brown-700: #665945;
  --color-heavy-brown-800: #4b4131;
  --color-heavy-brown-900: #342c22;
  --color-heavy-brown-950: #201911;
}

SCSS

$heavy-brown: #7b6a50;
$heavy-brown-rgb: 123, 106, 80;
$heavy-brown-light: mix(#fff, $heavy-brown, 20%);
$heavy-brown-dark: mix(#000, $heavy-brown, 20%);

.element {
  color: $heavy-brown;
  box-shadow: 0 0 0 2px rgba($heavy-brown, 0.35);
}