This file is indexed.

/usr/share/themes/Xfce-basic/gtk-3.0/gtk.css is in gtk3-engines-xfce 3.2.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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* {
    engine: xfce;

    -xfce-smooth-edge: true;
    -xfce-grip-style: disabled;

    -GtkButton-default-border        : 0;
    -GtkButton-default-outside-border: 0;
    -GtkWidget-focus-line-width      : 1;
    -GtkWidget-focus-padding         : 2;
    -GtkMenuBar-shadow-type          : out;
    -GtkToolbar-shadow-type          : out;
    -GtkWidget-interior-focus        : true;
    -GtkRange-slider-width           : 14;
    -GtkRange-stepper-size           : 14;
    -GtkRange-stepper-spacing        : 0;
    -GtkRange-trough-border          : 0;
}

*:insensitive {
    text-shadow: 1px 1px white;
}

GtkComboBox {
    padding: 0px;
}

GtkComboBox .button {
    padding: 1px;
}

.button {
    border-width: 2px 2px;

    background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#DCDAD5, 1.1)), to(shade(#DCDAD5, 1.0)));
}                                                         
                                                          
.button:active {                                          
    background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#9E9A91, 1.0)), to(shade(#9E9A91, 1.1)));
}                                                         
                                                          
.button:insensitive {                                     
    background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#C8C5BE, 1.1)), to(shade(#C8C5BE, 1.0)));
}                                                         
                                                          
.button:hover {                                           
    background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#4B6983, 1.1)), to(shade(#4B6983, 1.0)));
}

.button:selected {
    background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#4B6983, 1.0)), to(shade(#4B6983, 1.1)));
}

.menuitem {
    border-width: 0px 0px;
}

.scrollbar, .scale {
    border-width: 2px 2px;
}