Sienna Yellow

CSS

:root {
  --sienna-yellow: #f1d28c;
  --sienna-yellow-rgb: 241 210 140;
  --sienna-yellow-oklch: oklch(0.874 0.095 86.6);
}

.element {
  color: var(--sienna-yellow);
  background-color: hsl(42 78% 75%);
  border-color: oklch(0.874 0.095 86.6);
}

Tailwind CSS v4

@theme {
  --color-sienna-yellow: #f1d28c;
  --color-sienna-yellow-50: #fff4d7;
  --color-sienna-yellow-100: #f5e7c5;
  --color-sienna-yellow-200: #e5d3a6;
  --color-sienna-yellow-300: #cbb57f;
  --color-sienna-yellow-400: #b79b5a;
  --color-sienna-yellow-500: #a28132;
  --color-sienna-yellow-600: #896e2c;
  --color-sienna-yellow-700: #6d5823;
  --color-sienna-yellow-800: #523f17;
  --color-sienna-yellow-900: #392c0f;
  --color-sienna-yellow-950: #231903;
}

SCSS

$sienna-yellow: #f1d28c;
$sienna-yellow-rgb: 241, 210, 140;
$sienna-yellow-light: mix(#fff, $sienna-yellow, 20%);
$sienna-yellow-dark: mix(#000, $sienna-yellow, 20%);

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