#A69797

CSS

:root {
  --sphinx: #a69797;
  --sphinx-rgb: 166 151 151;
  --sphinx-oklch: oklch(0.689 0.018 17.6);
}

.element {
  color: var(--sphinx);
  background-color: hsl(0 8% 62%);
  border-color: oklch(0.689 0.018 17.6);
}

Tailwind CSS v4

@theme {
  --color-sphinx: #a69797;
  --color-sphinx-50: #faf3f3;
  --color-sphinx-100: #eee6e5;
  --color-sphinx-200: #dcd1d1;
  --color-sphinx-300: #c0b4b4;
  --color-sphinx-400: #a99a9a;
  --color-sphinx-500: #928282;
  --color-sphinx-600: #7b6e6e;
  --color-sphinx-700: #635858;
  --color-sphinx-800: #484040;
  --color-sphinx-900: #322c2c;
  --color-sphinx-950: #1e1919;
}

SCSS

$sphinx: #a69797;
$sphinx-rgb: 166, 151, 151;
$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);
}