diff --git a/app/assets/javascripts/module/graphic.js.coffee b/app/assets/javascripts/module/graphic.js.coffee
index dc6387f..4b6d6ad 100644
--- a/app/assets/javascripts/module/graphic.js.coffee
+++ b/app/assets/javascripts/module/graphic.js.coffee
@@ -15,4 +15,4 @@ class Module.Graphic
             display(data,container)
 
   display: (data, container) ->
-    $('div#'+container).html('<img id="' + container + '" src="data:image/png;base64,' + data + '" />')
\ No newline at end of file
+    $('div#'+container).html('<img id="' + container + '" src="data:image/png;base64,' + data + '" class="img-rounded"/>')
\ No newline at end of file
diff --git a/app/controllers/modules_controller.rb b/app/controllers/modules_controller.rb
index 5ad33e5..b726786 100644
--- a/app/controllers/modules_controller.rb
+++ b/app/controllers/modules_controller.rb
@@ -26,7 +26,9 @@ class ModulesController < ApplicationController
     graphic.hide_title = true
     graphic.hide_legend = true
     graphic.theme = {
-      :background_colors => 'transparent'
+      colors: ['grey'],
+      marker_color: 'black',
+      background_colors: '#fff',
     }
 
     graphic.labels = Hash[dates.each_with_index.map{ |date, index| [index, date.to_s]}]
--
libgit2 0.21.2