Add a 300px buffer for circle anomalies.

Author: BenDol

src/main/java/gwt/material/design/addins/client/cutout/MaterialCutOut.java

@@ -309,7 +309,7 @@ public void open() {
         docStyle.setProperty("overflow", "hidden");
 
         if(backgroundSize == null) {
-            backgroundSize = body().width() + "px";
+            backgroundSize = body().width() + 300 + "px";
         }
 
         setupTransition();