Borders
Use border utilities to quickly style the border and border-radius of an element.
Border
Use border utilities to add or remove an element's borders. Choose from all borders or one at a time. See the Bootstrap documentation for a full list of options. Bootstrap Borders Documentation
Extra classes
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For the centered border, the classes are named using the format, border-{side}-centered-{size}, for faded border one use border-{side}-centered-faded.
The size defined in percentage, values 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
Side values can be: top, left, bottom and right.