Margins

Bootstrap provided new margin classes in version 4 but in some cases those are not enough so I added several more to make your design process faster

1. margin all 4rem m-a-4
2. margin top 4rem m-t-4
3. margin right 4rem m-r-4
4. margin bottom 4rem m-b-4
5. margin left 4rem m-l-4
6. margin x-axis 4rem m-x-4
7. margin y-axis 4rem m-y-4