/usr/share/themes/oxygen-gtk/gtk-3.0/gtk-csd.css is in gtk3-engines-oxygen 1.3.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* CSD *
*******/
.titlebar {
border-radius: 7px 7px 0px 0px;
}
.tiled .titlebar {
border-radius: 0;
}
.maximized .titlebar {
border-radius: 0;
}
/* this is the default titlebar that is added by GTK
* when client-side decorations are in use and the application
* did not set a custom titlebar.
*/
.titlebar.default-decoration {
border: none;
box-shadow: none;
}
.titlebar .titlebutton {
background: none;
padding: 5px 5px 6px 5px;
border-radius: 3px;
}
.window-frame {
border-radius: 4px;
border-width: 1px;
border-style: solid;
box-shadow: 0 2px 8px 3px black;
/* this is used for the resize cursor area */
margin: 10px;
}
.window-frame.tiled {
border-radius: 0;
}
.window-frame:backdrop {
box-shadow: 0 2px 5px 1px black;
}
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