[gnome-boxes] resource-graph: Don't style using classnames

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 4f16e8e8abfedc21fb7fe9bbcbd83ba636e7d975
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Mar 15 18:15:06 2016 +0000

    resource-graph: Don't style using classnames
    
    This doesn't work anymore with latest gtk+.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763677

 data/gtk-style.css        |    2 +-
 data/ui/resource-graph.ui |    3 +++
 2 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/data/gtk-style.css b/data/gtk-style.css
index 9a5ec12..9f9efc2 100644
--- a/data/gtk-style.css
+++ b/data/gtk-style.css
@@ -15,7 +15,7 @@
     background-color: @theme_fg_color;
 }
 
-BoxesResourceGraph {
+.boxes-resource-graph {
     background-color: @boxes_bg_color;
     border-color: @theme_fg_color;
     color: @theme_bg_color;
diff --git a/data/ui/resource-graph.ui b/data/ui/resource-graph.ui
index 9b382ac..578a867 100644
--- a/data/ui/resource-graph.ui
+++ b/data/ui/resource-graph.ui
@@ -5,5 +5,8 @@
     <property name="visible">True</property>
     <property name="width-request">32</property>
     <property name="hexpand">True</property>
+    <style>
+      <class name="boxes-resource-graph"/>
+    </style>
   </template>
 </interface>