#834539

CSS

:root {
  --red-robin: #834539;
  --red-robin-rgb: 131 69 57;
  --red-robin-oklch: oklch(0.464 0.088 32.1);
}

.element {
  color: var(--red-robin);
  background-color: hsl(10 39% 37%);
  border-color: oklch(0.464 0.088 32.1);
}

Tailwind CSS v4

@theme {
  --color-red-robin: #834539;
  --color-red-robin-50: #ffede5;
  --color-red-robin-100: #ffded5;
  --color-red-robin-200: #f7c8bc;
  --color-red-robin-300: #e0a89a;
  --color-red-robin-400: #cd8b7e;
  --color-red-robin-500: #b97061;
  --color-red-robin-600: #9c5f52;
  --color-red-robin-700: #7d4c42;
  --color-red-robin-800: #5d3630;
  --color-red-robin-900: #412520;
  --color-red-robin-950: #2a1410;
}

SCSS

$red-robin: #834539;
$red-robin-rgb: 131, 69, 57;
$red-robin-light: mix(#fff, $red-robin, 20%);
$red-robin-dark: mix(#000, $red-robin, 20%);

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