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Set a blue border to an element in Bootstrap
Use the border-primary class to set a blue border to an element.
For a blue border, add the class, as if you add it for <div> or any other element −
<div class="demo border border-primary"> </div>
Let us see an example to set a blue border −
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: 350px; height: 170px; margin: 10px; } </style> </head> <body> <div class="container"> <h2>Demo Heading</h2> <div class="demo border border-primary">This rectangle has blue border</div> </div> </body> </html>
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