title: How to set FontAwesome icon width, height and positioning according to its parent's width and height?
body: <p>I am using FontAwesome icons on my webpage. The height and width of the div, which contains the icon, is based on user input. I want the icon to fit inside div as the div height and width changes. I also want to center the icon inside that div.
  There is very limited information regarding this on the web.</p>
  
  <p><strong>Can I get/set font-height or font-width via font-size? Any relation between font-size and font-height/width?</strong></p>