CSS Problems on mobile

Hi Guys !!

I added this code to functions.php, and works like a charm (almost ..)

add_filter(‘avf_logo’,’av_change_logo’);
function av_change_logo($logo)
{
if(wp_is_mobile() )
{
$logo = “web-mini-logo.png”;
}
return $logo;
};

Logo and all header (including search field) works fine on all platforms BUT Ipads.

So I need to things:

1. If possible, on ipads (resolution of xxx and over) show the normal logo. Maybe change the filter for ipad resolution… is that possible, or adding a class, or something.

2. Fixe the css since it changes the search field aspect, I could not figure out how to fix it.

Thanks a lot !!!