Borders
Border sizes
  Use the border classes to custom the border of any element. They are working with the base size of a 1px,
  $bd-base-width: 1px used for every variant.
  
  You can custom the $bd-base-width variable by downloading the source files. 
  All you have to specify is the class .bd-{space-number} where the space number can
  be :
| Space number | Real space | 
|---|---|
| 0 | 0px | 
| 1 | 1px | 
| 2 | 1.5px | 
| 3 | 2px | 
| 4 | 4px | 
| 5 | 6px | 
Border styles
  The borders classes allow you to modify the border appearance. 
  The classes are .bd-{borderStyle} where borderStyle can be : 
  
    dashed | dotted | double | groove | hidden | none | inset | outset | ridge | solid | revert
  
  
  Examples : 
Card
    This is an example card with solid borders
  Card
    This is an example card with dotted borders
  Borders on specific sides
You can specify the style for each border of an element. To make it, use the following classes :
| Description | Class name | Possible values | 
|---|---|---|
| Top border | .bd-t-{value} | 0 | 1 | ... | 5 | 
| Right border | .bd-r-{value} | 0 | 1 | ... | 5 | 
| Bottom border | .bd-b-{value} | 0 | 1 | ... | 5 | 
| Left border | .bd-l-{value} | 0 | 1 | ... | 5 | 
You can apply the border style classes on specific sides too.
Card
    This is an example card with specific borders
  Card
    This is an example card with specific borders
  Card
    This is an example card with specific borders
  
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