A container is an element that holds all your site contents. You can configure container settings via Admin Dashboard >Ziri > Settings > General Settings.
The following are the settings that you can use to manage your site container.

Container Width – You can set the site container width for different devices via this option.
Narrow Container width – This will adjust the narrow container width for all the pages and posts resulting in a focused and tight presentation that is ideal for smaller screens and limited places.

