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/usr/share/doc/lightdm-gtk-greeter/sample-lightdm-gtk-greeter.css is in lightdm-gtk-greeter 1.8.4-0ubuntu1.

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

The actual contents of the file can be viewed below.

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/*
Theming samples for lightdm-gtk-greeter 1.8

Below are two samples of what a greeter theme in Gtk3 could look like. For the first one, we're only using the lightdm-gtk-greeter style-class. This is best if you just want to set a simple color-scheme.
For more fine-grain control, you can also use the named widgets. Those are being used in the second sample, because that gives you maximum control over the greeter.

*/

/*************************
 * 1. Minimalistic theme *
 *************************/

.lightdm-gtk-greeter {
    background-color: black;
    color: white;
}


/*************************
 * 2. Advanced theme *
 *************************/
 
/* the panel widget at the top */
#panel_window {
    background-color: alpha (black, 0.5);
    color: white;
    font: bold;
    text-shadow: 0 1px alpha(black, 0.5);
    icon-shadow: 0 1px alpha(black, 0.5);
    box-shadow: inset 0 -1px alpha (black, 0.5);
}

/* the menubars/menus of the panel, i.e. indicators */
#panel_window .menubar,
#panel_window .menubar > .menuitem {
    background-color: transparent;
    color: white;
    font: bold;
    text-shadow: 0 1px alpha(black, 0.5);
    icon-shadow: 0 1px alpha(black, 0.5);
}

#panel_window .menubar .menuitem:insensitive {
    color: alpha(white, 0.7);
    text-shadow: none;
}

#panel_window .menubar .menu {
    border-radius: 1px;
}

#panel_window .menubar .menu .menuitem {
    font: normal;
    text-shadow: none;
}

/* the login window */
#login_window,
#shutdown_dialog,
#restart_dialog {
    border-style: none;
    border-radius: 5px;
    background-color: @lightdm_bg_color;
    color: @lightdm_fg_color;
    /* the window widget doesn't have a border, so draw border using box-shadow */
    box-shadow: inset 1px 0 shade(@lightdm_bg_color, 0.6),
                inset -1px 0 shade(@lightdm_bg_color, 0.6),
                inset 0 1px shade(@lightdm_bg_color, 0.6),
                inset 0 -1px shade(@lightdm_bg_color, 0.6);
}

/* the top half of the login-window, in GtkDialog terms, the content */
#content_frame {
    padding-bottom: 14px;
}

/* the user-combobox */
#login_window .menu {
    border-radius: 1px;
}

#login_window GtkComboBox .button,
#login_window GtkComboBox .button:hover,
#login_window GtkComboBox .button:active,
#login_window GtkComboBox .button:active:hover,
#login_window GtkComboBox .button:focus,
#login_window GtkComboBox .button:hover:focus,
#login_window GtkComboBox .button:active:focus,
#login_window GtkComboBox .button:active:hover:focus {
    padding: 0;
    background: none;
    border-style: none;                                      
    box-shadow: none;
}

#login_window GtkComboBox .button:focus,
#login_window GtkComboBox .button:hover:focus,
#login_window GtkComboBox .button:active:focus,
#login_window GtkComboBox .button:active:hover:focus {
    box-shadow: inset 1px 0 alpha(@theme_selected_bg_color, 0.6),
                inset -1px 0 alpha(@theme_selected_bg_color, 0.6),
                inset 0 1px alpha(@theme_selected_bg_color, 0.6),
                inset 0 -1px alpha(@theme_selected_bg_color, 0.6);
}

#login_window #user_combobox {
    color: @lightdm_fg_color;
    font: 18px;
}

#login_window #user_combobox .menu {
    font: normal;
}

#login_window #user_combobox .arrow {
    color: mix(@lightdm_fg_color, @lightdm_bg_color, 0.5);
}

/* the entries, one for the username, one for the password */
#login_window .entry {
    padding: 3px 5px;
    border-width: 1px;
    border-style: solid;
    border-color: shade(@lightdm_bg_color, 0.8);
    border-radius: 3px;
    background-image: linear-gradient(to bottom,
                                      shade(@lightdm_bg_color, 0.95),
                                      shade(@lightdm_bg_color, 0.97) 30%,
                                      shade(@lightdm_bg_color, 1.02)
                                      );

    color: @lightdm_fg_color;
                                      
    box-shadow: none;
    transition: all 150ms ease-out;
}

#login_window .entry:focus,
#login_window .entry:hover {
    border-color: shade(@lightdm_bg_color, 0.7);

    box-shadow: inset 1px 0 alpha(@dark_shadow, 0.10),
                inset 0 1px alpha(@dark_shadow, 0.12),
                inset -1px 0 alpha(@dark_shadow, 0.10);
}

/* the buttons, alternatively this could also be done with a simple ".lightdm-gtk-greeter .button" */
#login_window .button,
#shutdown_dialog .button,
#restart_dialog .button {
    padding: 3px 15px;
    transition: all 150ms ease-out;
}

/* the user's avatar box */
#user_image {
    padding: 3px;
    border-radius: 3px;
    /* draw border using box-shadow */
    box-shadow: inset 1px 0 shade(@lightdm_bg_color, 0.75),
                inset -1px 0 shade(@lightdm_bg_color, 0.75),
                inset 0 1px shade(@lightdm_bg_color, 0.55),
                inset 0 -1px shade(@lightdm_bg_color, 1.8);
}

/* the border around the user's avatar box */
#user_image_border {
    border-radius: 3px;
    box-shadow: inset 0 1px shade(@lightdm_bg_color, 0.8),
                inset 0 -1px shade(@lightdm_bg_color, 0.55);
    background-image: linear-gradient(to bottom,
                                      shade(@lightdm_bg_color, 0.9),
                                      shade(@lightdm_bg_color, 0.98) 10%,
                                      shade(@lightdm_bg_color, 1.0) 99%,
                                      shade(@lightdm_bg_color, 1.0)
                                      );
}

/* the lower half of the login-window, in GtkDialog terms the buttonbox or action area */
#buttonbox_frame {
    padding-top: 20px;
    padding-bottom: 0px;
    border-style: none;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
    background-image: linear-gradient(to bottom,
                                      shade(@bg_color, 0.85),
                                      shade(@bg_color, 0.98) 10%,
                                      shade(@bg_color, 1.0) 99%,
                                      shade(@bg_color, 1.0)
                                      );
    box-shadow: inset 1px 0 shade(@lightdm_bg_color, 0.6),
                inset -1px 0 shade(@lightdm_bg_color, 0.6),
                inset 0 1px shade(@lightdm_bg_color, 0.6),
                inset 0 -1px shade(@lightdm_bg_color, 0.6);
}

/* the buttons that have focus by default in each window */
#login_window .button.default,
#shutdown_dialog .button.default,
#restart_dialog .button.default,
#login_window .button:focus,
#login_window .button:active:focus,
#shutdown_dialog .button:focus,
#shutdown_dialog .button:active:focus,
#restart_dialog .button:focus,
#restart_dialog .button:active:focus {
    border-color: shade(@theme_selected_bg_color, 0.8);
    background-image: linear-gradient(to bottom,
                                      shade(@theme_selected_bg_color, 1.02),
                                      shade(@theme_selected_bg_color, 0.95) 90%,
                                      shade(@theme_selected_bg_color, 0.90)
                                      );

    color: @theme_selected_fg_color;
}

#login_window .button.default:hover,
#shutdown_dialog .button.default:hover,
#restart_dialog .button.default:hover,
#login_window .button:hover:focus,
#login_window .button:active:hover:focus,
#shutdown_dialog .button:hover:focus,
#shutdown_dialog .button:active:hover:focus,
#restart_dialog .button:hover:focus,
#restart_dialog .button:active:hover:focus {
    border-color: shade(@theme_selected_bg_color, 0.7);
    background-image: linear-gradient(to bottom,
                                      shade(@theme_selected_bg_color, 1.12),
                                      shade(@theme_selected_bg_color, 1.05) 90%,
                                      shade(@theme_selected_bg_color, 1.00)
                                      );
}

/* the shutdown button */
#shutdown_button.button {
    border-color: shade(@error_bg_color, 0.8);
    background-image: linear-gradient(to bottom,
                                      shade(@error_bg_color, 1.02),
                                      shade(@error_bg_color, 0.95) 90%,
                                      shade(@error_bg_color, 0.90)
                                      );

    color: @error_fg_color;
}

#shutdown_button.button:hover,
#shutdown_button.button:active,
#shutdown_button.button:active:hover {
    border-color: shade(@error_bg_color, 0.7);
    background-image: linear-gradient(to bottom,
                                      shade(@error_bg_color, 1.12),
                                      shade(@error_bg_color, 1.05) 90%,
                                      shade(@error_bg_color, 1.00)
                                      );
}

/* the restart button */
#restart_button.button {
    border-color: shade(@warning_bg_color, 0.8);
    background-image: linear-gradient(to bottom,
                                      shade(@warning_bg_color, 1.02),
                                      shade(@warning_bg_color, 0.95) 90%,
                                      shade(@warning_bg_color, 0.90)
                                      );

    color: @warning_fg_color;
}

#restart_button.button:hover,
#restart_button.button:active,
#restart_button.button:active:hover {
    border-color: shade(@warning_bg_color, 0.7);
    background-image: linear-gradient(to bottom,
                                      shade(@warning_bg_color, 1.12),
                                      shade(@warning_bg_color, 1.05) 90%,
                                      shade(@warning_bg_color, 1.00)
                                      );
}

/* the warning, in case a wrong password is entered or something else goes wrong according to PAM */
#greeter_infobar {
    border-bottom-width: 0;
    font: bold;
}