title: Vaadin, applying own theme doesn't work
body: <p>I am trying to add custom theme to my Vaadin 7 project. I used the Vaadin plug-in theme creater, it created the necessary files and I included a simple background-color setting to my table, but even though reindeer theme is included it doesn't seem to work. After I apply my theme with <code>@Theme()</code> annotation on my UI class my table disappears and I get this (without the custom theme it looks fine):</p>
  
  <p><img src="https://i.stack.imgur.com/3Ay0I.png" alt="enter image description here"></p>
  
  <p>I read the part of the Book of Vaadin that describes this (<a href="https://vaadin.com/book/-/page/themes.creating.html" rel="nofollow noreferrer">https://vaadin.com/book/-/page/themes.creating.html</a>) but it still doesn't work for me.
  I read this part: <a href="https://vaadin.com/book/-/page/themes.html#figure.themes.theme-contents" rel="nofollow noreferrer">https://vaadin.com/book/-/page/themes.html#figure.themes.theme-contents</a> and it shows reindeer should be under themes, but it says I have to include the vaadin-themes.jar and it will work fine. I did add it, my filestructure looks like this: </p>
  
  <p><img src="https://i.stack.imgur.com/vif2P.png" alt="enter image description here">  </p>
  
  <p>airlinedb_customtheme.scss file's code:</p>
  
  <pre><code>@import "../reindeer/reindeer.scss";
  @mixin airlinedb_customtheme {
    @include reindeer;
    .v-table {
      background-color: red;
    }
  }
  </code></pre>
  
  <p>and my theme's styles.scss:</p>
  
  <pre><code>@import "airlinedb_customtheme.scss";
  .airlinedb_customtheme {
     @include airlinedb_customtheme;
   }
  </code></pre>
  
  <p>What am I missing? It looks like to me that reindeer style isn't included but I have no idea why.</p>
  
  <p>EDIT:Furthermore, how can I give background color for my button and my table-row?</p>