#757915

CSS

:root {
  --olive: #757915;
  --olive-rgb: 117 121 21;
  --olive-oklch: oklch(0.555 0.115 112);
}

.element {
  color: var(--olive);
  background-color: hsl(62 70% 28%);
  border-color: oklch(0.555 0.115 112);
}

Tailwind CSS v4

@theme {
  --color-olive: #757915;
  --color-olive-50: #f4fad4;
  --color-olive-100: #e7edc1;
  --color-olive-200: #d3daa2;
  --color-olive-300: #b6be79;
  --color-olive-400: #a0a550;
  --color-olive-500: #888d1e;
  --color-olive-600: #73771d;
  --color-olive-700: #5c6017;
  --color-olive-800: #45450d;
  --color-olive-900: #303008;
  --color-olive-950: #1c1c00;
}

SCSS

$olive: #757915;
$olive-rgb: 117, 121, 21;
$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);
}