title: Vaadin change Theme
body: <p>how can I edit the given Themes in Vaadin.</p>
  
  <p>I use IntelliJ Idea to develop my Vaadin-App and want to edit a existing Theme like valo. 
  In my project, I haven´t a Folder like VAADIN or Webcontent. </p>
  
  <p>This is my Idea-Project:</p>
  
  <p><a href="https://i.stack.imgur.com/WKbJa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WKbJa.png" alt="enter image description here"></a></p>
  
  <p>How can i create a scss File to edit the style of my application?
  I use Vaadin 7, IntelliJ Idea 15.0.2 and Java 1.7.
  To change existing Themes I use</p>
  
  <pre><code>@Theme("valo")
  public class MyVaadinApplication extends UI {
      ...
  }
  </code></pre>