There is an error on the server now preventing your website from being displayed as it should, I know this happened after updating Pro theme to the latest version, that's why I recommend checking the server error log files to see if there is any error messages related to Pro theme that caused this issue, to do that there is two ways:
Consult your hosting provider regarding the location of the server error log files.
Edit wp-config.php file and replace this line:
After that, reload any page on your website and once it shows the white screen of death, check (/wp-content/debug.log) file for any error message there.
Most probably it's a memory limitation issue that causes such a problem, if so, please follow this guide to increase the memory limit on your server:
If you couldn't resolve this issue at this stage, then please provide us with FTP login details in a Secure Note reply so we can investigate this issue.
P.S. If you don't know how to send a Secure Note, please check this article.