It’s not the server error log. It looks like that a local log but we need a server error log.
And update PHP on your site, please, https://prnt.sc/1qbomta
Problem on your site looks like PHP memory or max length issue. Because once I remove the footer and half of the page content, save it then site displays. If I add any additional elements again (no matter what elements) then page is blank again. So, looks like some resources limit is reached. Server error logs will help to understand which one. So, contact your hosting provider to get that log file with the full list of the errors that happen on your site.
