Border classes
You can add solid borders to an element using following classes. You're able to change the border color using border color utility classes.
The classes follows b{side}-{size} format, where {size} is one of 0, 1, 2, or 3 values. Also, {side} is one of:
t: Border topb: Border bottoml: Border leftr: Border rightx: Border left and righty: Border top and bottom- null: All sides
 
<div class="b-1"></div><div class="bx-2"></div><div class="by-3"></div><div class="bl-3 border-primary"></div><div class="br-2 border-purple"></div><div class="bt-1 border-danger"></div><div class="bb-1 border-info"></div>Following table demonstrates available classes for 1px border.
| Class name | Description | 
|---|---|
.bt-1 | 
							  border-top: 1px solid ... | 
.bb-1 | 
							  border-bottom: 1px solid ... | 
.bl-1 | 
							  border-left: 1px solid ... | 
.br-1 | 
							  border-right: 1px solid ... | 
.bx-1 | 
							  border-left: 1px solid ... border-right: 1px solid ...  | 
							
.by-1 | 
							  border-top: 1px solid ... border-bottom: 1px solid ...  | 
							
.b-1 | 
							  border: 1px solid ... | 

