title: change back button arrow color in ionic 3
body: <p>How to change back button color in ionic 3? (From white to black color). It's screenshot with this button:</p>
  
  <p><a href="https://i.stack.imgur.com/VNgPd.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VNgPd.png" alt="enter image description here"></a></p>