title: Change element style from controller Ionic 2
body: <p>My code:</p>
  
  <pre><code>document.querySelector(".myTabs .line")[0].style.left = '30%' ;
  </code></pre>
  
  <p>By i have error </p>
  
  <blockquote>
    <p>undefined is not an object (evaluating 'document.querySelector(".myTabs .line")[0].style')</p>
  </blockquote>
  
  <p>How i can change css style from controller?</p>