1.

Center the Bootstrap modal vertically and horizontally within the page

Answer»

Use the .modal-dialog-centered class to center the Bootstrap modal vertically and horizontally within the page.

<div class="modal-dialog modal-dialog-centered">

Generally, by DEFAULT, a modal appears like this. You can see it is not vertically and horizontally centered:

But, the modal after using the .modal-dialog-centered class will look vertically and horizontally centered:

Let us now see an example: 

<!DOCTYPE html> <html lang="en"> <head>   <TITLE>Bootstrap Modal</title>   <meta charset="utf-8">   <meta name="viewport" content="width=device-width, initial-scale=1">   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>   <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script> </head> <body> <div class="container">   <H2>Modal in Bootstrap</h2>   <p>Fading effect in Modal...</p>   <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#newModal">     Open   </button>   <div class="modal fade" id="newModal">     <div class="modal-dialog modal-dialog-centered">       <div class="modal-content">         <div class="modal-header">           <h4 class="modal-title">Modal Heading</h4>           <button type="button" class="close" data-dismiss="modal">&times;</button>         </div>         <div class="modal-body">           Body of the modal...         </div>         <div class="modal-footer">           <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>         </div>       </div>     </div>   </div> </div> </body> </html>

The above centers the Bootstrap modal vertically and horizontally within the page: 



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