How to make icon act like button in nav bar?

I have an icon heart on the nav bar inside a button element but the problem is when I click it, the whole button area gets animated.

Check out the SS.

I want that When i click on it only the heart icon gets clicked not the area around it.
Please help thanks.

Which version of ionic do you use? 1,2,3 ?

i am using ionic 3. Please help

you can use ion-button icon-only

<button ion-button icon-only>
  <ion-icon name="heart"></ion-icon>

check this link :