Layout changes

src/App.js

@@ -736,7 +736,7 @@ class App extends Component {
       if (allowMount) {
         mainContent.push((
           <div key={'md_' + key++}
-               style={{height: '69%'}}>
+               style={{height: '66%'}}>
             <MountItems allowConfig={allowConfig}
                         autoMountChanged={this.handleAutoMountChanged}
                         autoMountProcessed={this.notifyAutoMountProcessed}