The first box has only the base class applied. The second has the modifier "full" which gives it a round apperance. The last one has the modifier "none" which remove border radius from all sides.
Here we've only applied border radius to the sides.
Here we have a few more usage cases. The first box has the border base class and then removed the border on the top. The second box has a thicker border on the right and the last box has border applied on the left side and in the bottom.
This utlitiy is responsive and can be used like
|side||Specify specific side||top. left, right, bottom|
|width||Sets the width of elements borders||0, 1, 2|
Border colors can be applied. Here they are:
|name||Sets the color of elements borders||primary, secondary, success, danger, info, warning|