#A66049

CSS

:root {
  --red-cent: #a66049;
  --red-cent-rgb: 166 96 73;
  --red-cent-oklch: oklch(0.563 0.098 38.9);
}

.element {
  color: var(--red-cent);
  background-color: hsl(15 39% 47%);
  border-color: oklch(0.563 0.098 38.9);
}

Tailwind CSS v4

@theme {
  --color-red-cent: #a66049;
  --color-red-cent-50: #ffede0;
  --color-red-cent-100: #ffdecf;
  --color-red-cent-200: #fac7b5;
  --color-red-cent-300: #e4a791;
  --color-red-cent-400: #d18a73;
  --color-red-cent-500: #bd6e54;
  --color-red-cent-600: #a05d48;
  --color-red-cent-700: #804b39;
  --color-red-cent-800: #5f362a;
  --color-red-cent-900: #43251c;
  --color-red-cent-950: #2b130c;
}

SCSS

$red-cent: #a66049;
$red-cent-rgb: 166, 96, 73;
$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);
}