Is there a way I can remove the rounded borders on the top left and right corners of windows on Gnome Shell? How can I do it?
4 Answers
From the ArchLinux Forum:
edit the css in /usr/share/gnome-shell/theme/gnome-shell.css
(the .panel-corner properties).
The credit goes to the forum user "gimmy". Refer to the original forum in the sources below if you would like to view the entire thread.
Source: ArchLinux Forum - https://bbs.archlinux.org/viewtopic.php?id=138403
For the people who use a custom theme: A better way is to modify the gnome-shell css file of the theme. If you use a gnome-shell.css
file with your custom theme, edit the file with a text editor and just add these lines:
.panel-corner {
-panel-corner-radius: 0px;
-panel-corner-background-color: transparent;
-panel-corner-border-width: 0px;
-panel-corner-border-color: transparent;
}
"Remove Rounded Corners extension" is a good extension but sometimes it bugs with the "User Theme" extension...

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Any easier way to remove rounded corners and have it persist even after theme updates is to use the Remove Rounded Corners extension.

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This doesn't work in Ubuntu Precise anymore, it says that the GNOME3 there is too old. – pts Mar 07 '13 at 14:49
There is a package called GNOME Tweak Tool sudo apt-get install gnome-tweak-tool
that allows you to make changes to the interface, and install new themes. You can find additional GNOME-Shell themes here, and perhaps other sites as well.

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1Yes, I know how to change theme, but I want to change edit Adwaita theme. – user25119 Mar 21 '12 at 14:33