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Bootstrap 4 Button .btn-outline-warning class
To set an outline on a button that indicates warning, you need to use the btn-outline class in Bootstrap.
For my class, I have taken the below button −
<button type="button" class="btn btn-outline-warning"> Warning (Errors) </button>
The button above has the class btn-outline-warning that allow us to add an orange outline stating warning action −
You can try to run the following code to implement the btn-outline-warning class −
Example
<!DOCTYPE html> <html> <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> </head> <body> <h2>Warning</h2> <p>The following are the warning messages:</p> <ul class = "list-group"> <li class = "list-group-item">semi-colon (;) missing</li> <li class = "list-group-item">infinite loop</li> </ul> <p>For more warning messages:</p> <button type="button" class="btn btn-outline-warning">Warning (Errors)</button> </body> </html>
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