#A99699

CSS

:root {
  --sphinx: #a99699;
  --sphinx-rgb: 169 150 153;
  --sphinx-oklch: oklch(0.691 0.023 6.9);
}

.element {
  color: var(--sphinx);
  background-color: hsl(351 10% 63%);
  border-color: oklch(0.691 0.023 6.9);
}

Tailwind CSS v4

@theme {
  --color-sphinx: #a99699;
  --color-sphinx-50: #fbf3f4;
  --color-sphinx-100: #efe5e6;
  --color-sphinx-200: #ded0d2;
  --color-sphinx-300: #c3b3b5;
  --color-sphinx-400: #ab999c;
  --color-sphinx-500: #948083;
  --color-sphinx-600: #7e6d6f;
  --color-sphinx-700: #645759;
  --color-sphinx-800: #4a3f41;
  --color-sphinx-900: #332c2d;
  --color-sphinx-950: #1f191a;
}

SCSS

$sphinx: #a99699;
$sphinx-rgb: 169, 150, 153;
$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);
}