#A66561

CSS

:root {
  --rustling-leaves: #a66561;
  --rustling-leaves-rgb: 166 101 97;
  --rustling-leaves-oklch: oklch(0.577 0.085 23.8);
}

.element {
  color: var(--rustling-leaves);
  background-color: hsl(3 28% 52%);
  border-color: oklch(0.577 0.085 23.8);
}

Tailwind CSS v4

@theme {
  --color-rustling-leaves: #a66561;
  --color-rustling-leaves-50: #ffede9;
  --color-rustling-leaves-100: #ffded9;
  --color-rustling-leaves-200: #f7c7c2;
  --color-rustling-leaves-300: #e0a7a1;
  --color-rustling-leaves-400: #cc8b86;
  --color-rustling-leaves-500: #b86f6b;
  --color-rustling-leaves-600: #9b5e5b;
  --color-rustling-leaves-700: #7d4b48;
  --color-rustling-leaves-800: #5c3635;
  --color-rustling-leaves-900: #412524;
  --color-rustling-leaves-950: #291313;
}

SCSS

$rustling-leaves: #a66561;
$rustling-leaves-rgb: 166, 101, 97;
$rustling-leaves-light: mix(#fff, $rustling-leaves, 20%);
$rustling-leaves-dark: mix(#000, $rustling-leaves, 20%);

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