Custom code is necessary for me.
I use Mappress with user management plugin. Every users have address custom field, and I want to show a map with all users which address is assigned to POI.
So the first case works fine, I could gave up the second case.
I think I’ve solved my problem.
I want to make map responsible not only width but also height (eg. on iPhone, fit width to screen and set height to 300px).
I’ve set height of mapp-canvas class in custom CSS (including media query), it works.