MainView CSS and Live Updating

Hi,

I’m new to Vaadin and trying it out for a new project. I hope you can help me with the following question:

I’ve chosen V14 with the base you can download and a menu on the left. I’d like to change the stripline between the menu (foldout) and

the main frame. How would I access it?

The second thing I’d like to do is basically have an upload window and once the correct file has been uploaded change the whole window

to an big output. Can I do that live or do I have to do some kind of redirect to a second page/View?

Thanks in advance