#A79796

CSS

:root {
  --sphinx: #a79796;
  --sphinx-rgb: 167 151 150;
  --sphinx-oklch: oklch(0.69 0.019 21.9);
}

.element {
  color: var(--sphinx);
  background-color: hsl(4 9% 62%);
  border-color: oklch(0.69 0.019 21.9);
}

Tailwind CSS v4

@theme {
  --color-sphinx: #a79796;
  --color-sphinx-50: #fbf3f2;
  --color-sphinx-100: #eee5e5;
  --color-sphinx-200: #dcd1d0;
  --color-sphinx-300: #c1b4b3;
  --color-sphinx-400: #aa9a99;
  --color-sphinx-500: #938180;
  --color-sphinx-600: #7c6e6d;
  --color-sphinx-700: #635857;
  --color-sphinx-800: #494040;
  --color-sphinx-900: #322c2c;
  --color-sphinx-950: #1e1919;
}

SCSS

$sphinx: #a79796;
$sphinx-rgb: 167, 151, 150;
$sphinx-light: mix(#fff, $sphinx, 20%);
$sphinx-dark: mix(#000, $sphinx, 20%);

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