#7D694C

CSS

:root {
  --heavy-brown: #7d694c;
  --heavy-brown-rgb: 125 105 76;
  --heavy-brown-oklch: oklch(0.532 0.049 76.6);
}

.element {
  color: var(--heavy-brown);
  background-color: hsl(36 24% 39%);
  border-color: oklch(0.532 0.049 76.6);
}

Tailwind CSS v4

@theme {
  --color-heavy-brown: #7d694c;
  --color-heavy-brown-50: #fdf4e6;
  --color-heavy-brown-100: #f1e6d6;
  --color-heavy-brown-200: #e0d2bd;
  --color-heavy-brown-300: #c5b59c;
  --color-heavy-brown-400: #af9b7e;
  --color-heavy-brown-500: #998261;
  --color-heavy-brown-600: #816e53;
  --color-heavy-brown-700: #685842;
  --color-heavy-brown-800: #4d402f;
  --color-heavy-brown-900: #352c20;
  --color-heavy-brown-950: #201910;
}

SCSS

$heavy-brown: #7d694c;
$heavy-brown-rgb: 125, 105, 76;
$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);
}