I try to add my own CSS to the panel but I have some problems with own font files for icons.
In my panel.css who is saved at assets/css I import the icon.css-file through @import because I cannot add multiple css files through the config file.
In the icon.css I load the font files with @font-face. The the relative fontpath to …/assets/fonts/ are okay but I get an error 500 for all font files?
The same font files will be loaded perfect for the frontend.
What could also the reason for the 500 error?