#837800

CSS

:root {
  --olive: #837800;
  --olive-rgb: 131 120 0;
  --olive-oklch: oklch(0.565 0.119 103.1);
}

.element {
  color: var(--olive);
  background-color: hsl(55 100% 26%);
  border-color: oklch(0.565 0.119 103.1);
}

Tailwind CSS v4

@theme {
  --color-olive: #837800;
  --color-olive-50: #faf8d1;
  --color-olive-100: #edebbd;
  --color-olive-200: #dbd89c;
  --color-olive-300: #c0bb72;
  --color-olive-400: #aba146;
  --color-olive-500: #958900;
  --color-olive-600: #7e740a;
  --color-olive-700: #655d0a;
  --color-olive-800: #4b4303;
  --color-olive-900: #342e03;
  --color-olive-950: #201b00;
}

SCSS

$olive: #837800;
$olive-rgb: 131, 120, 0;
$olive-light: mix(#fff, $olive, 20%);
$olive-dark: mix(#000, $olive, 20%);

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