@sirrahikkala is just a word of advice to you, so this never happens again. Whenever you are planning to do an update to an important and front-facing WordPress plugin (particularly if there are customers in the mix):
1-) Don’t immediately update once a new major release of the plugin is out, unless there’s a fixed security issue, in which case exercise caution and follow all the next good practices. Just wait a few days until major bugs are discovered and fixed, then update.
2-) Always make sure you have created a backup of the current version of the plugin files so you may immediately go back if things go wrong.
3-) Makes sure to make a backup of your databases if the plugin you are trying to update includes databases.
4-) Before attempting to change CSS and fix the mess, just try going back to the previous version of the plugin and also look for support from the developers, so you don’t add even more issues to the problem.
Hope this helps in the future.
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This reply was modified 11 months, 3 weeks ago by Eli.