On a wide screen container, and on a narrow screen container-fluid?

Question

css

How can I make it so that when entering from a wide screen, the container class is used, and when entering from a narrow screen, container-fluid ?
Problems with 5s. Indentation in the middle of the content on the sides. Although when you change the width on a PC, everything is fine.
// for some reason it does not switch to mobile mode, although col-xs is set everywhere like.

Answer 1

At < 768 .container is 100% wide and has 15px padding. If it's different for you, then you've done something yourself.