This file is indexed.

/usr/share/themes/oxygen-gtk/gtk-3.0/gtk-csd.css is in gtk3-engines-oxygen 1.4.1-2.

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, .headerbar
{
    border-radius: 4px 4px 0px 0px;
}

.tiled .titlebar,
.tiled .headerbar,
.maximized .titlebar,
.maximized .headerbar
{
    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;
}

/* shadows are handled in oxygenqtsettings */