This file is indexed.

/usr/share/themes/Xfce-flat/gtk-3.0/apps/lightdm-gtk-greeter.css is in gtk3-engines-xfce 3.2.0-2.

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

The actual contents of the file can be viewed below.

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/* General colors for the greeter */
#login_window,
#panel_window,
#panel_window .menubar,
#panel_window .menubar > .menuitem,
#restart_dialog,
#shutdown_dialog,
#login_window,
#login_window #user_combobox .arrow {
    background-color: shade (@lightdm_bg_color, 0.9);
    color: @lightdm_fg_color;
}

/* Add border-outlines to all the dialogs */
#restart_dialog,
#shutdown_dialog,
#login_window {
    border-width: 0px;
    border-style: solid;
    border-color: @dark_shadow;
    box-shadow: inset 1px 0px alpha(@light_shadow,0.2),
                inset -1px 0px alpha(@light_shadow,0.2),
                inset 0px 1px alpha(@light_shadow,0.2),
                inset 0px -1px alpha(@light_shadow,0.2);
    border-radius: 10px;
}

/* Set all buttons and the user-avatar to a dark style */
#login_window .button,
#restart_dialog .button,
#shutdown_dialog .button,
#user_image {
    background-color: shade(@lightdm_bg_color, 0.9);
    background-image: none;
    color: @lightdm_fg_color;
    border-color: alpha(@dark_shadow, 0.9);
    border-radius: 4px;
    text-shadow: 0px 1px alpha(@dark_shadow, 1.0);
    box-shadow: inset 1px 0px alpha(@light_shadow, 0.2),
                inset -1px 0px alpha(@light_shadow, 0.2),
                inset 0px 1px alpha(@light_shadow, 0.3),
                inset 0px -1px alpha(@light_shadow, 0.1);
}

/* Add some padding to the buttons, except the user-combobox */
#cancel_button,
#login_button,
#shutdown_button,
#restart_button {
    padding: 4px 16px 4px 16px;
}

/* Add more padding to the user-avatar */
#user_image {
    padding: 4px;
}

/* Highlight for default-buttons and focus for better keyboard-navigation */
#login_window .button.default,
#restart_dialog .button.default,
#shutdown_dialog .button.default,
#login_window .button:focus,
#restart_dialog .button:focus,
#shutdown_dialog .button:focus {
    background-color: shade(@lightdm_bg_color, 1.25);
    box-shadow: inset 1px 0px alpha(@light_shadow, 0.3),
                inset -1px 0px alpha(@light_shadow, 0.3),
                inset 0px 1px alpha(@light_shadow, 0.4),
                inset 0px -1px alpha(@light_shadow, 0.2);
}

/* General button hover-effect */
#login_window .button:hover,
#restart_dialog .button:hover,
#shutdown_dialog .button:hover {
    background-color: shade(@lightdm_bg_color, 1.35);
}

/* Login/Unlock button is blue on hover */
#login_button.button:hover {
    background-color: shade(@theme_selected_bg_color, 0.6);
}

/* Shutdown button is red on hover */
#shutdown_button.button:hover {
    background-color: shade(@error_bg_color,0.95);
}

/* Restart button is dark yellow on hover */
#restart_button.button:hover {
    background-color: shade(@warning_bg_color,0.75);
}