I recently encountered the same problem and I discovered a fix to it.
If you tried other tips and it didn't help just remove the line from css stylesheet and put it only in the html header like this

1. Remove this from css; @import url('https://fonts.googleapis.com/css?family=Poppins');

2. and Put only this in the html header; (<link ref='https://fonts.googleapis.com/css?family=Poppins' rel='stylesheet'>)