title: Ionic2 tabs - how to change selected tab's color?
body: <p>Like in the title, I want to change the background-color of selected tab. I didn't find  any variable allowing this in the documentation. (<a href="http://ionicframework.com/docs/v2/theming/overriding-ionic-variables/" rel="nofollow">http://ionicframework.com/docs/v2/theming/overriding-ionic-variables/</a>). How to achieve it? </p>