#7E694C

CSS

:root {
  --heavy-brown: #7e694c;
  --heavy-brown-rgb: 126 105 76;
  --heavy-brown-oklch: oklch(0.534 0.05 75.3);
}

.element {
  color: var(--heavy-brown);
  background-color: hsl(35 25% 40%);
  border-color: oklch(0.534 0.05 75.3);
}

Tailwind CSS v4

@theme {
  --color-heavy-brown: #7e694c;
  --color-heavy-brown-50: #fdf4e6;
  --color-heavy-brown-100: #f1e6d6;
  --color-heavy-brown-200: #e0d2bd;
  --color-heavy-brown-300: #c6b59b;
  --color-heavy-brown-400: #b09b7e;
  --color-heavy-brown-500: #9a8261;
  --color-heavy-brown-600: #826e52;
  --color-heavy-brown-700: #685842;
  --color-heavy-brown-800: #4d402f;
  --color-heavy-brown-900: #362c20;
  --color-heavy-brown-950: #21190f;
}

SCSS

$heavy-brown: #7e694c;
$heavy-brown-rgb: 126, 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);
}