How to show application ads if the user accessed the site from the phone?

Question

Android

Google, unfortunately, there is little time ..
Maybe you often met when, when you enter the site, a recommendation to install their application pops up from above?
Can anyone suggest solutions or working examples? Right now I can't access these sites.

Answer 1

Along the way, I hurried with the question .. There is a special html5 meta tag
for iOS
For android found only:
jasny.github.io/jquery.smartbanner/#

Answer 2

google for: " @media css"