title: Centering input box and icon button
body: <p>I want to center vertically both of the input box and the icon button.
  I tried flexbox justify-content and align-content and it still not working.
  Is there any way in css that i can do this? Thank you.</p>
  
  <p><img src="https://i.stack.imgur.com/33dwE.jpg" alt=""></p>