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Add a red border to an element in Bootstrap to indicate danger
To add a red border to an element, you need to implement the border-danger class.
Red border implement danger and you can set danger messages inside it.
Implementing the border-danger is quite easy −
<div class="new border border-danger"> Red Border </div>
Let us see an example to work with the border-danger Bootstrap 4 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> .new { width: 120px; height: 120px; margin: 20px; } </style> </head> <body> <div class="container"> <p>Rectangle with red border:</p> <div class="new border border-danger">Red Border</div> </div> </body> </html>
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