This Tutorial Shows how to Reverse the Stacking Order of a 2 Column Layout On Mobile Devices
By default, multiple column layouts will change to single column, full-width for mobile screen sizes.
Normally, the stacking order will be the left column will be on top and the right column will be on bottom (if more than two columns, the order will follow from left to right changing from top to bottom).
In some cases for mobile displays, you want to have the right column on top and the left column on bottom.
This tutorial shows you how to do that using the code snippet below.