#A6634D

CSS

:root {
  --red-cent: #a6634d;
  --red-cent-rgb: 166 99 77;
  --red-cent-oklch: oklch(0.569 0.093 38.9);
}

.element {
  color: var(--red-cent);
  background-color: hsl(15 37% 48%);
  border-color: oklch(0.569 0.093 38.9);
}

Tailwind CSS v4

@theme {
  --color-red-cent: #a6634d;
  --color-red-cent-50: #ffede1;
  --color-red-cent-100: #ffded0;
  --color-red-cent-200: #f8c8b6;
  --color-red-cent-300: #e2a893;
  --color-red-cent-400: #cf8b75;
  --color-red-cent-500: #bb6f57;
  --color-red-cent-600: #9e5f4a;
  --color-red-cent-700: #7f4c3b;
  --color-red-cent-800: #5e362b;
  --color-red-cent-900: #42251d;
  --color-red-cent-950: #2a130d;
}

SCSS

$red-cent: #a6634d;
$red-cent-rgb: 166, 99, 77;
$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);
}