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Bootstrap 4 .border-primary class
Add a blue border to an element in Bootstrap 4 using the border-primary class as shown below:
Set the class as −
<div class="demo border border-primary"> Blue Border </div>
You can try to run the following code to implement the border-primary class −
Example
<!DOCTYPE html> <html lang="en">   <head>     <title>Bootstrap Example</title>     <meta charset="utf-8">     <meta name="viewport" content="width=device-width, initial-scale=1">     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>     <style>     .demo {       width: 250px;       height: 170px;       margin: 10px;     }     </style>   </head> <body>   <div class="container">     <h3>Demo Heading</h3>     <div class="demo border border-primary">Blue Border</div>   </div> </body> </html>Advertisements
 