not going to use compton , might do it later.

added CSS stylesheet.

configure.ac

@@ -38,6 +38,7 @@ AC_SUBST([WEB_EXTENSION_LIBS])
 dnl ###########################################################################
 dnl Configurable values
 dnl ###########################################################################
+
 THEME_DIR="/usr/share/lightdm-webkit/themes"
 AC_ARG_WITH(theme-dir,
             AS_HELP_STRING(--with-theme-dir=<path>,
@@ -49,6 +50,9 @@ AC_ARG_WITH(theme-dir,
 AC_SUBST(THEME_DIR)
 AC_DEFINE_UNQUOTED(THEME_DIR, "$THEME_DIR", Theme Dir)
 
+dnl ###########################################################################
+dnl ###########################################################################
+
 CONFIG_DIR="/etc/lightdm/"
 AC_ARG_WITH(config-dir,
             AS_HELP_STRING(--with-config-dir=<path>,
@@ -60,6 +64,9 @@ AC_ARG_WITH(config-dir,
 AC_SUBST(CONFIG_DIR)
 AC_DEFINE_UNQUOTED(CONFIG_DIR, "$CONFIG_DIR", Config Dir)
 
+dnl ###########################################################################
+dnl ###########################################################################
+
 DESKTOP_DIR="/usr/share/xgreeters/"
 AC_ARG_WITH(desktop-dir,
             AS_HELP_STRING(--with-desktop-dir=<path>,
@@ -71,6 +78,22 @@ AC_ARG_WITH(desktop-dir,
 AC_SUBST(DESKTOP_DIR)
 AC_DEFINE_UNQUOTED(DESKTOP_DIR, "$DESKTOP_DIR", Desktop Dir)
 
+dnl ###########################################################################
+dnl ###########################################################################
+
+AC_ARG_ENABLE([at-spi-command],
+    AC_HELP_STRING([--enable-at-spi-command[=command]], [Try to start at-spi service]])
+    AC_HELP_STRING([--disable-at-spi-command], [Do not start at-spi service]),
+    [], [])
+
+AS_IF([test "x$enable_at_spi_command" != "xno"],
+[
+    if test "x$enable_at_spi_command" = "xyes" || test "x$enable_at_spi_command" = "x"; then
+        enable_at_spi_command="/usr/lib/at-spi2-core/at-spi-bus-launcher --launch-immediately"
+    fi
+    AC_DEFINE_UNQUOTED([AT_SPI_COMMAND], ["$enable_at_spi_command"], [Command to start at-spi service])
+])
+
 dnl ###########################################################################
 dnl Internationalization
 dnl ###########################################################################

data/Makefile.am

@@ -1,17 +1,13 @@
 etcdir = /etc/lightdm/
 etc_DATA = \
-	lightdm-webkit2-greeter.conf \
-	lightdm-webkit2-greeter-compton.conf
-
-dist_bin_SCRIPTS = lightdm-webkit2-greeter-start
+	lightdm-webkit2-greeter.conf
 
 desktopdir = $(DESKTOP_DIR)
 desktop_DATA = lightdm-webkit2-greeter.desktop
 
 EXTRA_DIST = \
 	$(etc_DATA) \
-	$(desktop_DATA) \
-	$(dist_bin_SCRIPTS)
+	$(desktop_DATA)
 
 DISTCLEANFILES = \
 	Makefile.in

data/lightdm-webkit2-greeter-compton.conf

@@ -6,10 +6,6 @@ clear-shadow = true;
 shadow-radius = 7;
 shadow-offset-x = -7;
 shadow-offset-y = -7;
-# shadow-opacity = 0.7;
-# shadow-red = 0.0;
-# shadow-green = 0.0;
-# shadow-blue = 0.0;
 shadow-exclude = [
 	"name = 'Notification'",
 	"class_g = 'Conky'",
@@ -17,70 +13,47 @@ shadow-exclude = [
 	"class_g = 'Cairo-clock'",
 	"_GTK_FRAME_EXTENTS@:c"
 ];
-# shadow-exclude = "n:e:Notification";
-# shadow-exclude-reg = "x10+0+0";
-# xinerama-shadow-crop = true;
 
 # Opacity
 menu-opacity = 0.8;
 inactive-opacity = 0.8;
-# active-opacity = 0.8;
 frame-opacity = 0.7;
 inactive-opacity-override = false;
 alpha-step = 0.06;
-# inactive-dim = 0.2;
-# inactive-dim-fixed = true;
-# blur-background = true;
-# blur-background-frame = true;
 blur-kern = "3x3box"
-# blur-kern = "5,5,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1"
-# blur-background-fixed = true;
 blur-background-exclude = [
 	"window_type = 'dock'",
 	"window_type = 'desktop'",
 	"_GTK_FRAME_EXTENTS@:c"
 ];
-# opacity-rule = [ "80:class_g = 'URxvt'" ];
 
 # Fading
 fading = true;
 # fade-delta = 30;
 fade-in-step = 0.03;
 fade-out-step = 0.03;
-# no-fading-openclose = true;
-# no-fading-destroyed-argb = true;
-fade-exclude = [ ];
+no-fading-openclose = false;
 
 # Other
-backend = "xrender"
+backend = "glx"
 mark-wmwin-focused = true;
 mark-ovredir-focused = true;
-# use-ewmh-active-win = true;
 detect-rounded-corners = true;
 detect-client-opacity = true;
 refresh-rate = 0;
-vsync = "none";
+vsync = "opengl";
 dbe = false;
 paint-on-overlay = true;
-# sw-opti = true;
-# unredir-if-possible = true;
-# unredir-if-possible-delay = 5000;
-# unredir-if-possible-exclude = [ ];
 focus-exclude = [ "class_g = 'Cairo-clock'" ];
 detect-transient = true;
 detect-client-leader = true;
 invert-color-include = [ ];
-# resize-damage = 1;
 
 # GLX backend
-# glx-no-stencil = true;
+glx-no-stencil = true;
 glx-copy-from-front = false;
-# glx-use-copysubbuffermesa = true;
-# glx-no-rebind-pixmap = true;
+glx-use-copysubbuffermesa = false;
 glx-swap-method = "undefined";
-# glx-use-gpushader4 = true;
-# xrender-sync = true;
-# xrender-sync-fence = true;
 
 # Window type settings
 wintypes:

data/lightdm-webkit2-greeter-start

@@ -1,4 +0,0 @@
-#!/bin/bash
-
-[[ which compton ]] && compton --config /etc/lightdm/lightdm-webkit2-greeter-compton.conf &
-lightdm-webkit2-greeter

data/lightdm-webkit2-greeter.desktop

@@ -1,6 +1,6 @@
 [Desktop Entry]
 Name=LightDM WebKit2 Greeter
 Comment=LightDM Greeter
-Exec=lightdm-webkit2-greeter-start
+Exec=lightdm-webkit2-greeter
 Type=Application
 X-Ubuntu-Gettext-Domain=lightdm-webkit2-greeter

src/Makefile.am

@@ -24,7 +24,11 @@ liblightdm_webkit2_greeter_ext_la_LDFLAGS = -module -avoid-version -no-undefined
 greeter_PROGRAMS = lightdm-webkit2-greeter
 greeterdir = $(bindir)
 
+lightdm_webkit2_greeter_built_sources = \
+	lightdm-webkit2-greeter-css-application.h
+
 lightdm_webkit2_greeter_SOURCES = \
+	$(lightdm_webkit2_greeter_built_sources) \
 	lightdm-webkit2-greeter.c
 
 lightdm_webkit2_greeter_CFLAGS = \
@@ -40,5 +44,11 @@ lightdm_webkit2_greeter_LDADD = \
 	$(WEB_EXTENSION_LIBS) \
 	$(LIBX11_LIBS)
 
+lightdm-webkit2-greeter-css-application.h: $(srcdir)/lightdm-webkit2-greeter-application.css Makefile
+	$(AM_V_GEN) exo-csource --static --name=lightdm_webkit2_greeter_css_application $< >$@
+
+BUILT_SOURCES = \
+	$(lightdm_webkit2_greeter_built_sources)
+
 DISTCLEANFILES = \
 	Makefile.in

src/lightdm-webkit2-greeter.c

@@ -43,6 +43,8 @@
 
 #include <config.h>
 
+#include "src/lightdm-webkit2-greeter-css-application-css.h"
+
 static GtkWidget      *web_view;
 static GtkWidget      *window;
 static WebKitSettings *webkit_settings;
@@ -150,13 +152,13 @@ static gboolean
 fade_timer_cb(gpointer data) {
 	gdouble opacity;
 
-	opacity = gtk_widget_get_opacity(window);
+	opacity = gtk_widget_get_opacity(web_view);
 	opacity -= 0.1;
 	if (opacity <= 0) {
 		gtk_main_quit();
 		return FALSE;
 	}
-	gtk_widget_set_opacity(window, opacity);
+	gtk_widget_set_opacity(web_view, opacity);
 
 	return TRUE;
 }
@@ -180,6 +182,7 @@ main(int argc, char **argv) {
 	GdkRGBA                  bg_color;
 	WebKitUserContentManager *manager;
 	WebKitWebContext         *context;
+	GtkCssProvider           *css_provider;
 
 	g_unix_signal_add(SIGTERM, (GSourceFunc) quit_cb, /* is_callback */ GINT_TO_POINTER(TRUE));
 
@@ -207,6 +210,15 @@ main(int argc, char **argv) {
 	gdk_window_set_events(root_window, gdk_window_get_events(root_window) | GDK_SUBSTRUCTURE_MASK);
 	gdk_window_add_filter(root_window, wm_window_filter, NULL);
 
+	// Setup CSS provider
+	css_provider = gtk_css_provider_new();
+	gtk_css_provider_load_from_data(css_provider,
+									lightdm_webkit2_greeter_css_application,
+									lightdm_webkit2_greeter_css_application_length, NULL);
+	gtk_style_context_add_provider_for_screen(screen,
+											  GTK_STYLE_PROVIDER(css_provider),
+											  GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
 	// Register and connect handler for setting the web extensions directory so webkit can find our extension
 	context = webkit_web_context_get_default();
 	g_signal_connect(context, "initialize-web-extensions", G_CALLBACK(initialize_web_extensions_cb), NULL);