Source: dist/css/library_boot.css, line 8551
10.3.3.4.1 Inset Margin Level -1
The list of classes used on the body tag
Example
m-x_n2 m-x_n3:md m-x_n4:lg
NOTE:
Combination of classes used as a common decorators.m-x_n2 m-x_n3:md m-x_n4:lg