#7F7300

CSS

:root {
  --olive: #7f7300;
  --olive-rgb: 127 115 0;
  --olive-oklch: oklch(0.549 0.115 102.2);
}

.element {
  color: var(--olive);
  background-color: hsl(54 100% 25%);
  border-color: oklch(0.549 0.115 102.2);
}

Tailwind CSS v4

@theme {
  --color-olive: #7f7300;
  --color-olive-50: #faf8d2;
  --color-olive-100: #eeebbe;
  --color-olive-200: #dcd79e;
  --color-olive-300: #c1bb74;
  --color-olive-400: #aca14a;
  --color-olive-500: #96880e;
  --color-olive-600: #7e7312;
  --color-olive-700: #655c0f;
  --color-olive-800: #4c4307;
  --color-olive-900: #352e05;
  --color-olive-950: #201b00;
}

SCSS

$olive: #7f7300;
$olive-rgb: 127, 115, 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);
}