← Back to Bootstrap Course | Chapter 8: Components — Modals & Offcanvas | Lesson 2 of 8

Modal sizes

Modal size classes make dialogs small, large or extra large, or full screen.

In this page:

  1. Modal sizes
Syntax
markup
<div class="modal-dialog modal-lg">...</div>
<div class="modal-dialog modal-sm">...</div>
<div class="modal-dialog modal-fullscreen">...</div>

Modal sizes

Add .modal-sm, .modal-lg or .modal-xl to the .modal-dialog, or use .modal-fullscreen (and breakpoint versions like .modal-fullscreen-md-down). Center vertically with .modal-dialog-centered. The default width adapts to the screen size.

Note: modal-dialog-centered vertically centres the dialog.

Example: Modal sizes

markup
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body class="p-3">
<div class="container">
  <button class="btn btn-outline-primary" data-bs-toggle="modal" data-bs-target="#big">Large centred modal</button>
  <div class="modal fade" id="big" tabindex="-1" aria-hidden="true">
    <div class="modal-dialog modal-lg modal-dialog-centered">
      <div class="modal-content"><div class="modal-body">This is a <b>large</b>, vertically centred modal.</div></div>
    </div>
  </div>
</div>
</body>
</html>
Live Example
Related Topics
Common Mistakes
  1. Putting size classes on modal-content
  2. Forgetting vertical centering option
  3. Using fixed widths
Chapter Summary
  • modal-sm, lg, xl on the dialog
  • modal-fullscreen for full screen
  • modal-dialog-centered centres
  • Sizes go on modal-dialog
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