#7A694E

CSS

:root {
  --heavy-brown: #7a694e;
  --heavy-brown-rgb: 122 105 78;
  --heavy-brown-oklch: oklch(0.53 0.045 79);
}

.element {
  color: var(--heavy-brown);
  background-color: hsl(37 22% 39%);
  border-color: oklch(0.53 0.045 79);
}

Tailwind CSS v4

@theme {
  --color-heavy-brown: #7a694e;
  --color-heavy-brown-50: #fcf4e7;
  --color-heavy-brown-100: #f0e7d7;
  --color-heavy-brown-200: #ded3bf;
  --color-heavy-brown-300: #c3b69e;
  --color-heavy-brown-400: #ad9c81;
  --color-heavy-brown-500: #978364;
  --color-heavy-brown-600: #7f6f55;
  --color-heavy-brown-700: #665944;
  --color-heavy-brown-800: #4b4131;
  --color-heavy-brown-900: #342c21;
  --color-heavy-brown-950: #201a10;
}

SCSS

$heavy-brown: #7a694e;
$heavy-brown-rgb: 122, 105, 78;
$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);
}