At the backend after we edit CSS and we can't save in the end. The save is fail, it can't load to T4 Blank until we re-loading it again. The Button Save, Save and Close and Close don't working on that time.. Here is the Video https://www.dropbox.com/s/hcvxc36vsbdrfth/Joomlart.mov?dl=0
saovry
Could you check at the end of that custom css code in backend again?
I just added a comment and it saved normally.
I tested it again. It seems this bug with safari Version 14.0.2 (16610.3.7.1.9) and MacOS Big Sur Version 11.1.
I tested with Chrom, it saves normal as you told me...
Thank you..