Diff of SC.BaseTheme.imageButtonRenderDelegate and the corresponding CSS file

gistfile1.diff

diff --git a/themes/ace/resources/button/ace/button.css b/themes/ace/resources/button/ace/button.css
index 6934b86..4d3b2eb 100644
--- a/themes/ace/resources/button/ace/button.css
+++ b/themes/ace/resources/button/ace/button.css
@@ -26,3 +26,16 @@ $theme.button {
     margin-top: 0px;
   }
 }
+
+
+$theme.image-button {
+  border: 0px none;
+  
+  .img {
+    position:absolute;
+    left: 0px;
+    top: 0px;
+    right: 0px;
+    bottom: 0px;
+  }
+}