Monaco editor background is now defined in pxtarget.json

theme/style.less

@@ -106,19 +106,11 @@ span.blocklyTreeLabel {
              Monaco
 *******************************/
 
-.monaco-editor, .monaco-editor .inputarea {
-    background: #ecf0f1;
-}
-
 .monacoDraggableBlock {
     background: #ecf0f1;
     border: solid 3px #ecf0f1;
 }
 
-.monaco-editor-background {
-    background: #ecf0f1;
-}
-
 .monacoFlyout {
     background: rgba(82, 90, 103, 0.5);
 }