The basic layout used to contain form structures built based on 8/12 grid columns.
The Form Box is the most basic layout used to contain form structures. This layout is composed of a box that occupies 8 columns of the grid, with 2 offset columns on both sides.
Note that the form box layout changes from 8 to 12 columns on viewports that are equal to or less than 768px, in order to optimize space for content.