prevent scrollbar being shown while loading

plugins/c9.ide.layout.classic/loading-flat.css

@@ -186,5 +186,9 @@
     border: 0;
 }
 
+.loading {
+    overflow: hidden;
+}
+
 @-webkit-keyframes rotation { 0% { -webkit-transform: rotate(0deg); transform: rotate(0deg);  } 100% {-webkit-transform: rotate(359deg); transform: rotate(359deg);}}
         @keyframes rotation { 0% { -webkit-transform: rotate(0deg); transform: rotate(0deg); } 100% {-webkit-transform: rotate(359deg); transform: rotate(359deg); }}