#C38900

CSS

:root {
  --end-of-summer: #c38900;
  --end-of-summer-rgb: 195 137 0;
  --end-of-summer-oklch: oklch(0.67 0.139 78.6);
}

.element {
  color: var(--end-of-summer);
  background-color: hsl(42 100% 38%);
  border-color: oklch(0.67 0.139 78.6);
}

Tailwind CSS v4

@theme {
  --color-end-of-summer: #c38900;
  --color-end-of-summer-50: #fff2c9;
  --color-end-of-summer-100: #ffe4b3;
  --color-end-of-summer-200: #f3ce8f;
  --color-end-of-summer-300: #dcb05f;
  --color-end-of-summer-400: #ca9329;
  --color-end-of-summer-500: #b77800;
  --color-end-of-summer-600: #9a6500;
  --color-end-of-summer-700: #7c5100;
  --color-end-of-summer-800: #5d3a00;
  --color-end-of-summer-900: #412800;
  --color-end-of-summer-950: #2a1600;
}

SCSS

$end-of-summer: #c38900;
$end-of-summer-rgb: 195, 137, 0;
$end-of-summer-light: mix(#fff, $end-of-summer, 20%);
$end-of-summer-dark: mix(#000, $end-of-summer, 20%);

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