The center layout helper creates a vertical strip of content inside a given container element, with equal spacing on either side. It uses the class
l-center. This technique is used on the
main element (albeit without using the
Padding on the sides of the center layout helper maintains a space between its contents and the edges of the parent container, even when the parent is narrower than the
max-width of the center layout.
The center layout helper uses an exception to the global
box-sizing: border-box; declaration. It uses
box-sizing: content-box; to prevent the padding from making the content narrower than intended.