Spacing

Some classes have been added to more or less emulate utility classes available in bootstrap 4.

Margins

In the form of m${sides}-${size} (sides included in t b l r)

Sizes as follow:

Denomination	Effect
xs	10px
sm	15px
md	20px
lg	40px

E.g : mt-lg mb-sm etc...

Width

In the form of w${value} with value included in a range from 5 to 100 in steps of 5 in %

E.g : w5 -> 5% ; w50 -> 50%