Doesn’t seem to work on page

I needed to do some work on this site; so I tried this plugin. When I enabled it (following the video and trying both maintenance and coming soon), all it seemed to do was disable the CSS on the page and break the page. When I disabled the plugin and refreshed the page, it was back to normal. I tried this several times with the same result. The Live Preview in the plugin settings looked fine, but it just doesn’t work for me. The site that I am trying it on is using a Divi child theme. Thanks for any help.

–Al

The page I need help with: [log in to see the link]