title: Angular 2 material tab active color customize
body: <p>I was looking to customize the active color for md-tab.
  <a href="https://i.stack.imgur.com/XuYHF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XuYHF.png" alt="enter image description here"></a></p>
  
  <p>The classes in chrome dev console shows ==> -mat-tab-label mat-ripple mat-tab-label-active. But none has any border bottom. There was a chevron class which i tried to change, but no effect.</p>
  
  <p>I tried /deep/ with almost all classes.  Dint work. 
  Also checked md-tab-header, but nowhere am seeing even that color! Any help would be appreciated :)</p>