Thanks everyone I already managed this issue by adding css name that are missing
May I know how did you manage to add the assets?
Please tell me the solution with some details, I am also facing the same problem
Simply fixing permissions worked for me:
sudo chmod -R 755 /home/frappe-user/
sudo chown -R $USER:$USER /home/frappe-user/
Also ran production setup to be sure
sudo bench setup production frappe-user