title: Change CSS class property with Vue.js
body: <p>I'm using Vue.js and I want to change a CSS class property. 
  The HTML code which uses the class is the following:</p>
  
  <pre><code>&lt;div class="fillTimerBar"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>And the CSS code:</p>
  
  <pre><code>.fillTimerBar {
          width: 100%;
          height: 8px;
   }
  </code></pre>
  
  <p>From there I want to change the <code>width</code> class property using a <code>computed</code> property from the Vue component.</p>
  
  <p>Which would be correct way if any?</p>