App does to fit in the simulator frame

Whenever I run my ios platform on ios simulator it shows all big window of simulator and the app still won’t fit in the simulator window . WHY ???

Your app pages are not responsive.

@thesourav … can you tell me more about it.
How Can I make it responsive?

I meant you have to enhance your CSS to accomodate this. Do you have a sample codepen?

I got it just adjusted window settings for simulator