#C68700

CSS

:root {
  --end-of-summer: #c68700;
  --end-of-summer-rgb: 198 135 0;
  --end-of-summer-oklch: oklch(0.67 0.141 75.9);
}

.element {
  color: var(--end-of-summer);
  background-color: hsl(41 100% 39%);
  border-color: oklch(0.67 0.141 75.9);
}

Tailwind CSS v4

@theme {
  --color-end-of-summer: #c68700;
  --color-end-of-summer-50: #fff1c9;
  --color-end-of-summer-100: #ffe3b3;
  --color-end-of-summer-200: #f6cd8f;
  --color-end-of-summer-300: #dfae5f;
  --color-end-of-summer-400: #ce9129;
  --color-end-of-summer-500: #ba7500;
  --color-end-of-summer-600: #9d6400;
  --color-end-of-summer-700: #7e5000;
  --color-end-of-summer-800: #5f3900;
  --color-end-of-summer-900: #422700;
  --color-end-of-summer-950: #2b1500;
}

SCSS

$end-of-summer: #c68700;
$end-of-summer-rgb: 198, 135, 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);
}