check the user agent to see if the browser is ios or android and add a class to the body

Check for mobile

    function isAppleDevice(){
      return (
        (navigator.userAgent.toLowerCase().indexOf("ipad") > -1) ||
        (navigator.userAgent.toLowerCase().indexOf("iphone") > -1) ||
        (navigator.userAgent.toLowerCase().indexOf("ipod") > -1)
        );
    }

    var isAndroid = navigator.userAgent.toLowerCase().indexOf("android");
    var appStoreURL = "";
    if(isAndroid > -1){
       $('body').addClass('android-device');      
    }
    else if( isAppleDevice() ){
       $('body').addClass('ios-device');
    }