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Bootstrap 4 Button .btn-outline-dark class
Use the .btn-outline-dark class in Bootstrap to set dark outline on a button.
The following is an example of a button with dark outline −

Set the above outline to the button, using the btn-outline-dark class as shown below −
<button type="button" class="btn btn-outline-dark"> Submit </button>
You can try to run the following code to implement the btn-outline-dark 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> </head> <body> <div class="container"> <h4>Bootstrap 4</h4> <p>Learning btn-outline-dark class usage:</p> <button type="button" class="btn btn-outline-dark">Submit</button> </div> </body> </html>
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