#A99697

CSS

:root {
  --sphinx: #a99697;
  --sphinx-rgb: 169 150 151;
  --sphinx-oklch: oklch(0.69 0.023 14.1);
}

.element {
  color: var(--sphinx);
  background-color: hsl(357 10% 63%);
  border-color: oklch(0.69 0.023 14.1);
}

Tailwind CSS v4

@theme {
  --color-sphinx: #a99697;
  --color-sphinx-50: #fcf3f3;
  --color-sphinx-100: #efe5e5;
  --color-sphinx-200: #ded1d1;
  --color-sphinx-300: #c3b3b3;
  --color-sphinx-400: #ab999a;
  --color-sphinx-500: #958081;
  --color-sphinx-600: #7e6d6e;
  --color-sphinx-700: #655758;
  --color-sphinx-800: #4a3f40;
  --color-sphinx-900: #332c2c;
  --color-sphinx-950: #1f1919;
}

SCSS

$sphinx: #a99697;
$sphinx-rgb: 169, 150, 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);
}