How to auto adjust the div size for all mobile / tablet display formats?

Question

I have designed a page where four div tags are there in the page. If I test the page in mobile phone (5 inch) it fits the page perfectly, If I test the same pag

Answer 1

I use something like this in my document.ready

var height = $(window).height();//gets height from device
var width = $(window).width(); //gets width from device

$("#container").width(width+"px");
$("#container").height(height+"px");