title: Disable hover background color change on ion-button Ionic 2
body: <p>I have three buttons. Two of them have changed background color by ngClass. When I hover one of the changed buttons, its background color changes back to default. How do I prevent this behavior?</p>
  
  <p>My problem in images:</p>
  
  <p>No hover image below:</p>
  
  <p><a href="https://i.stack.imgur.com/aEfp0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aEfp0.png" alt="enter image description here"></a>
  <br/> <br/>
  Top left image hovered below:</p>
  
  <p><a href="https://i.stack.imgur.com/w4Swu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/w4Swu.png" alt="enter image description here"></a></p>