Ever been annoyed by tiny buttons on mobile phones? I’m sure at least once in your life you have zoomed in on a page just to click on a small button. Don’t do this to your users. Of course you can increase the button size on small screens but it’s not always possible or the best solution. What can you do then? You can keep the button size same, but increase the clickable area. This way, the user can err by about 15px but still hit the button.