I just updated my laptop to Ubuntu 15.10 and I'm having a problem while using custom themes.

I've downloaded Ultra Flat theme from noobslab website and in some applications (I've detected the issue under nautilus and system preferences) it's not showing well. There is some bars around the window.

Bars around the window of system preferences

I've removed all themes to see if there is a conflict between them or something like that, then reboot and installed just Ultra flat theme.

I've used unity tweak tool and ubuntu tweak to apply the themes. What can I do to fix the problem?

I've asked too under Nooblab's website.

Thank you so much.


See solution on WebUpd8. Here is what it takes. Open a Terminal and:

mkdir -p ~/.config/gtk-3.0
gedit ~/.config/gtk-3.0/gtk.css

In the text editor window that appears enter:

.window-frame {
    box-shadow: none;
    margin: 1px;

Save file. Log out and then log back in.

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