Sticky Header and Gallery Lightbox in Oxygen

Looking for a way to fix sticky header covering up the lightbox in Oxygen‘s galleries?

Note: If your header has set to become sticky after scrolling down a certain distance, on initial page load the problem will not be present. But after scrolling down when the sticky appears, that is when the lightbox will appear below the fixed header.

Just add this CSS to fix:

body .pswp {
	z-index: 2147483640;
}

Before:

After: