Some CSS seems not to be loaded

Hi, I have some trouble with the update of Opigno, I tried doing it with and without composer for the same result. Thanks in advance, Lucien Badoux Edit: It was a matter of write permission for the folder /files. However I still have an issue, it is not critical because it is in the admin menu, so the students won't see it but if it propagate over time it won't be good. The menu has strange behavior with styling, it happens only in the Catalogue tab, and with all the navigators that I've try and another machine.