Butter

CSS

:root {
  --butter: #ffff81;
  --butter-rgb: 255 255 129;
  --butter-oklch: oklch(0.975 0.148 108.9);
}

.element {
  color: var(--butter);
  background-color: hsl(60 100% 75%);
  border-color: oklch(0.975 0.148 108.9);
}

Tailwind CSS v4

@theme {
  --color-butter: #ffff81;
  --color-butter-50: #f6fac9;
  --color-butter-100: #e9edb4;
  --color-butter-200: #d7db90;
  --color-butter-300: #bbbe60;
  --color-butter-400: #a6a524;
  --color-butter-500: #908c00;
  --color-butter-600: #797700;
  --color-butter-700: #615f00;
  --color-butter-800: #494500;
  --color-butter-900: #333000;
  --color-butter-950: #1e1c00;
}

SCSS

$butter: #ffff81;
$butter-rgb: 255, 255, 129;
$butter-light: mix(#fff, $butter, 20%);
$butter-dark: mix(#000, $butter, 20%);

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