#7A654D

CSS

:root {
  --heavy-brown: #7a654d;
  --heavy-brown-rgb: 122 101 77;
  --heavy-brown-oklch: oklch(0.521 0.045 70.3);
}

.element {
  color: var(--heavy-brown);
  background-color: hsl(32 23% 39%);
  border-color: oklch(0.521 0.045 70.3);
}

Tailwind CSS v4

@theme {
  --color-heavy-brown: #7a654d;
  --color-heavy-brown-50: #fdf3e8;
  --color-heavy-brown-100: #f1e6d8;
  --color-heavy-brown-200: #e0d2c0;
  --color-heavy-brown-300: #c6b49f;
  --color-heavy-brown-400: #b09a82;
  --color-heavy-brown-500: #9a8166;
  --color-heavy-brown-600: #826e57;
  --color-heavy-brown-700: #685845;
  --color-heavy-brown-800: #4d4032;
  --color-heavy-brown-900: #352c22;
  --color-heavy-brown-950: #211911;
}

SCSS

$heavy-brown: #7a654d;
$heavy-brown-rgb: 122, 101, 77;
$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);
}