pgadmin4 fails to start on fedora 27 (pgadmin4:10053): Gtk-WARNING **: Theme parsing error: gtk.css:8645:2: Junk at end of value for padding-left

(pgadmin4:10053): Gtk-WARNING **: Theme parsing error: gtk.css:13132:11: 'shadowbox' is not a valid property name

Can someone please help figure out why? Also help me with a solution.
Solved it! All, I had to do was enable a shell extension "Topicons plus" from gnome tweak.