Donate popup on our site being hidden by video

Hi there.

We are using your plugin in conjunction with https://codecanyon.net/item/woocommerce-fundraisers/9454661

It’s working perfectly well except in IE 11. When people using IE 11 click on the donate button, the pop up sits beneath the video and prevents people from donating. You can see our site here: https://passratechallenge.co.za/

Do you have any suggestions for how we could fix this?

Thanks so much,
Ashton

https://www.ads-software.com/plugins/featured-video-plus/