#A66654

CSS

:root {
  --red-cent: #a66654;
  --red-cent-rgb: 166 102 84;
  --red-cent-oklch: oklch(0.576 0.088 36.5);
}

.element {
  color: var(--red-cent);
  background-color: hsl(13 33% 49%);
  border-color: oklch(0.576 0.088 36.5);
}

Tailwind CSS v4

@theme {
  --color-red-cent: #a66654;
  --color-red-cent-50: #ffede3;
  --color-red-cent-100: #ffdfd3;
  --color-red-cent-200: #f7c8b9;
  --color-red-cent-300: #e0a997;
  --color-red-cent-400: #cc8c7a;
  --color-red-cent-500: #b8715c;
  --color-red-cent-600: #9c604f;
  --color-red-cent-700: #7d4c3f;
  --color-red-cent-800: #5d372e;
  --color-red-cent-900: #41261f;
  --color-red-cent-950: #29140f;
}

SCSS

$red-cent: #a66654;
$red-cent-rgb: 166, 102, 84;
$red-cent-light: mix(#fff, $red-cent, 20%);
$red-cent-dark: mix(#000, $red-cent, 20%);

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