Margin
Margin by Pixel (m + 0, 5, 10, ... 95, 100)
Margin utilities are using based on a global spacing scale which helps to keep horizontal and vertical spacing consistent. These utilities help us to reduce the amount of custom CSS that share the same properties, and allows to achieve many different page layouts using the same styles. Use CSS class like margin around 20 pixel m20
Margin all around by Pixel (m + 0, 5, 10, ... 95, 100)
Margin Left and Right around by Pixel (mlr + 0, 5, 10, ... 95, 100)
Margin Top and Bottom by Pixel (mtb + 0, 5, 10, ... 95, 100)
Margin top by Pixel (mt + 0, 5, 10, ... 95, 100)
Margin Right by Pixel (mr + 0, 5, 10, ... 95, 100)
Margin Bottom by Pixel (mb + 0, 5, 10, ... 95, 100)
Margin Left by Pixel (ml + 0, 5, 10, ... 95, 100)
Margin auto (mlauto, mrauto, mtauto, mbauto)
nav item with margine left and right properties