Good morning dear @magikiante. We are already working on fixing it.
Thank you so much for your time and sorry for any inconvenience 
Failed to load content css
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I've been getting the same error for the last few days. 
May 20, 2018
0
#4
I would recommend to refresh the page, log-out and then log-in and in case the error persists, send us a message please to support@chess.com
The error is gone after I've deleted cached web content and chess.com cookies, signed out and signed in again. So some combination of it has probably worked.
Hello,
Each time, i launch a new page, a red warning appear :
Failed to load content css: https://betacssjs.chesscomfiles.com/bundles/app/js/vendor/tinymce/skins/v2/lightgray/content.min.css
the same message occured on all my computers
have a nice day