Bootstrap 4
Bootstrap 4 Borders
The Bootstrap's different types border utilities to quickly style the border and border-radius of an element. Great for images, buttons, or any other element.
Basic Borders

Add classes to an element to remove all borders or some borders.

<style type="text/css">
.box{
width:100px;
height:80px;
background:#EEE;
margin:5px;
float:left;
border:1px solid #000;
}
</style>

<span class="box border"></span>
<span class="box border-0"></span>
<span class="box border-top-0"></span>
<span class="box border-right-0"></span>
<span class="box border-bottom-0"></span>
<span class="box border-left-0"></span>
Output :
Border Colors
<style type="text/css">
.box{
	width:100px;
	height:80px;
	background:#EEE;
	margin:5px;
	float:left;
}
</style>

<span class="box border border-primary"></span>
<span class="box border border-success"></span>
<span class="box border border-info"></span>
<span class="box border border-secondary"></span>
<span class="box border border-danger"></span>
<span class="box border border-warning"></span>
<span class="box border border-light"></span>
<span class="box border border-dark"></span>
<span class="box border border-white"></span>
Output :
Border-radius
<style type="text/css">
.box{
	width:100px;
	height:80px;
	margin:5px;
	float:left;
}
</style>

<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-top">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-right">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-bottom">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-left">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-circle">
<img src="../images/content/images-3.jpg" alt="Image Border" class="box rounded-0">
Output :