[evince] shell: Update sidebar thumbnails CSS nodes

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 16bbee9df797c9498b0be983d1bcde309e281824
Author: Trinh Anh Ngoc <atw1990 gmail com>
Date:   Sun Nov 29 09:28:29 2015 +0700

    shell: Update sidebar thumbnails CSS nodes
    
    Fixes frameless thumbnails with GTK+ 3.20
    
    https://bugzilla.gnome.org/show_bug.cgi?id=758793

 shell/ev-sidebar-thumbnails.c |    4 ++++
 shell/evince.css              |   11 +++--------
 2 files changed, 7 insertions(+), 8 deletions(-)
---
diff --git a/shell/ev-sidebar-thumbnails.c b/shell/ev-sidebar-thumbnails.c
index 9374034..d4c6de7 100644
--- a/shell/ev-sidebar-thumbnails.c
+++ b/shell/ev-sidebar-thumbnails.c
@@ -359,6 +359,10 @@ ev_sidebar_thumbnails_class_init (EvSidebarThumbnailsClass *ev_sidebar_thumbnail
        widget_class->map = ev_sidebar_thumbnails_map;
         widget_class->size_allocate = ev_sidebar_thumbnails_size_allocate;
 
+#if GTK_CHECK_VERSION(3, 20, 0)
+        gtk_widget_class_set_css_name (widget_class, "evsidebarthumbnails");
+#endif
+
        g_object_class_override_property (g_object_class,
                                          PROP_WIDGET,
                                          "main-widget");
diff --git a/shell/evince.css b/shell/evince.css
index b8dd5fd..4df7ba8 100644
--- a/shell/evince.css
+++ b/shell/evince.css
@@ -33,17 +33,12 @@ EvView.document-page.inverted {
     background-color: black;
 }
 
-EvSidebarThumbnails.page-thumbnail {
+evsidebarthumbnails.page-thumbnail {
     background-color: white;
-    border-color: black;
-    border-style: solid;
-    border-width: 1px;
-    border-radius: 0;
-    border-image: none;
-    padding: 0;
+    border: 1px solid black;
 }
 
-EvSidebarThumbnails.page-thumbnail.inverted {
+evsidebarthumbnails.page-thumbnail.inverted {
     background-color: black;
 }