#9C7058

CSS

:root {
  --pecan: #9c7058;
  --pecan-rgb: 156 112 88;
  --pecan-oklch: oklch(0.584 0.066 49.6);
}

.element {
  color: var(--pecan);
  background-color: hsl(21 28% 48%);
  border-color: oklch(0.584 0.066 49.6);
}

Tailwind CSS v4

@theme {
  --color-pecan: #9c7058;
  --color-pecan-50: #fff0e4;
  --color-pecan-100: #fbe2d4;
  --color-pecan-200: #eccdbb;
  --color-pecan-300: #d4ae99;
  --color-pecan-400: #bf937c;
  --color-pecan-500: #aa795e;
  --color-pecan-600: #906750;
  --color-pecan-700: #735240;
  --color-pecan-800: #563b2e;
  --color-pecan-900: #3c291f;
  --color-pecan-950: #25170f;
}

SCSS

$pecan: #9c7058;
$pecan-rgb: 156, 112, 88;
$pecan-light: mix(#fff, $pecan, 20%);
$pecan-dark: mix(#000, $pecan, 20%);

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