title: Optimal font size for a mobile webpage
body: <p>I know this question has been asked many times but I couldn't find a solution.
  I am designing a web page just for mobile phones. 
  I have tried to use <code>px, pt, percentage, em, vw, medium</code> but none of these gave me the optimum solution. I am testing it with iPhone 5, Android 4.0.3, Android 4.4.3 and Android 5.1.1</p>
  
  <p>Do you have any solutions for my case? </p>