After a quick check on your FTP, I noticed that the “style.css” file in the Gwangi Spiritual child theme had been renamed to “styleOld.css” which was the cause of the issue. I renamed that file to its original name “style.css” and it looks like your website is now up a running again. Please note that the “style.css” file is mandatory in any WordPress theme and renaming or deleting it will break the theme.
Hope this information helps you.
Best regards,