Add a max-width and center an Essential Grid

Essential Grid's are responsive by default, which means they'll always inherit the same width as your page's content area.
But if you'd like to reduce the size of your grid, this can be done by wrapping the grid's shortcode in an HTML "div" with some simple styles applied.

The “max-width” value will be the largest width you’d like the grid to be when your site is viewed on a regular desktop monitor.  The “margin: 0 auto” part is what will center the grid inside your page’s content area.