How to configure modal width in Bootstrap?

Last Updated : 14 Feb, 2020

Bootstrap Modal: It is a dialog window that opens inside the browser window on triggering certain events. It is a really convenient way to improve the website’s content rendering as per the requirements.
In this article, we will focus on adjusting the width/height of the modal box.

Method 1: Using pre-defined Bootstrap classes
Bootstrap has pre-defined classes for changing modal dimension attributes to be used with the div element containing .modal-dialog. These are listed below:

Small-sized modal: .modal-sm
Medium-sized modal: .modal-md
Large-sized modal: .modal-lg

<!-- Small Bootstrap Modal Example -->
<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="utf-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1">
    <link rel="stylesheet" 
          href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
  </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
  </script>
</head>
  
<body>
    <div class="container-fluid">
        <h2>Small Modal</h2>
        <p>Other classes mentioned above are also 
          implemented in the same manner.</p>
        <button type="button" 
                class="btn btn-success" 
                data-toggle="modal"
                data-target="#modal">
          Open Small-modal
      </button>
        <!-- Modal Code -->
        <div class="modal fade"
             id="modal" 
             role="dialog">
            <div class="modal-dialog modal-sm">
                <!-- .modal-sm here makes a small modal
       Can be replaced with '.modal-md' & '.modal-lg'
    -->
                <div class="modal-content">
                    <div class="modal-header">
                        <button type="button" 
                                class="close" 
                                data-dismiss="modal">
                          ×</button>
                        <h4 class="modal-title">
                          GeeksforGeeks
                      </h4>
                    </div>
                    <div class="modal-body">
                        <p>GeeksforGeeks - A computer
                          science portal for geeks</p>
                    </div>
                    <div class="modal-footer">
                        <button type="button"
                                class="btn btn-default"
                                data-dismiss="modal">
                          Close
                      </button>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>
  
</html>

Output:

Method 2: Using custom dimensions by tampering with default CSS attibutes
We can also customize the width/height of the modal by changing the CSS properties for the div containing .modal-dialog class. Below is the solution for the same.
Solution:

<!-- Changing CSS properties for the div 
containing '.modal-dialog' class -->
<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="utf-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1">
    <link rel="stylesheet" 
          href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
  </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
  </script>
    <style>
        .custom {
            width: 600px;
            min-height: 400px;
        }
    </style>
</head>
  
<body>
  
    <div class="container-fluid">
        <h2>Custom-sized Modal</h2>
        <p>We are changing CSS properties of div 
          containing the '.modal-dialog' to do the same.</p>
  
        <button type="button" 
                class="btn btn-success"
                data-toggle="modal"
                data-target="#modal">
          Open Custom-sized modal
      </button>
  
        <!-- Modal Code -->
        <div class="modal fade" 
             id="modal"
             role="dialog">
            <div class="modal-dialog">
                <!-- '.custom' class added here to do the same -->
                <div class="modal-content custom">
                    <div class="modal-header">
                        <button type="button"
                                class="close"
                                data-dismiss="modal">
                          ×
                      </button>
                        <h4 class="modal-title">
                          GeeksforGeeks
                      </h4>
                    </div>
                    <div class="modal-body">
                        <p>GeeksforGeeks - 
                          A computer science portal for geeks</p>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>
  
</html>

Output:

My Personal Notes

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