#864916

CSS

:root {
  --otterly-brown: #864916;
  --otterly-brown-rgb: 134 73 22;
  --otterly-brown-oklch: oklch(0.471 0.103 55.5);
}

.element {
  color: var(--otterly-brown);
  background-color: hsl(27 72% 31%);
  border-color: oklch(0.471 0.103 55.5);
}

Tailwind CSS v4

@theme {
  --color-otterly-brown: #864916;
  --color-otterly-brown-50: #ffefd9;
  --color-otterly-brown-100: #ffe0c7;
  --color-otterly-brown-200: #f7caa9;
  --color-otterly-brown-300: #e0aa83;
  --color-otterly-brown-400: #ce8e61;
  --color-otterly-brown-500: #ba723d;
  --color-otterly-brown-600: #9d6134;
  --color-otterly-brown-700: #7e4d2a;
  --color-otterly-brown-800: #5e381e;
  --color-otterly-brown-900: #422613;
  --color-otterly-brown-950: #2a1405;
}

SCSS

$otterly-brown: #864916;
$otterly-brown-rgb: 134, 73, 22;
$otterly-brown-light: mix(#fff, $otterly-brown, 20%);
$otterly-brown-dark: mix(#000, $otterly-brown, 20%);

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