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Bootstrap 5: How to align a modal to the center of the viewport without using fixed positioning?

πŸ‘€ Views: 21 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-27
bootstrap modal css responsive-design HTML

Hey everyone, I'm running into an issue that's driving me crazy. I'm upgrading from an older version and I'm trying to figure out I'm currently using Bootstrap 5 for a web application, and I've run into a problem with centering a modal... By default, Bootstrap modals are centered, but when I dynamically resize the modal's content, it doesn't remain centered within the viewport, especially on smaller devices. I tried adding custom CSS to enforce centering with `display: flex; justify-content: center; align-items: center;`, but this caused the modal to overlap with other elements on the page. I also checked the Bootstrap documentation for any properties related to modal alignment but didn't find anything useful. Here’s the code snippet I’m currently working with: ```html <div class="modal fade" id="myModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title" id="exampleModalLabel">Modal title</h5> <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button> </div> <div class="modal-body"> This is the modal body. </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button> <button type="button" class="btn btn-primary">Save changes</button> </div> </div> </div> </div> ``` I also tried using `modal-dialog-centered` class, but it only worked for the content that fits within a certain height. When the content height exceeds that threshold, the modal starts to scroll, and it looks awkward because the modal appears aligned at the top instead of the center. I would appreciate any insights on how to achieve perfect centering of the modal regardless of the content height, especially for responsive layouts. Any specific CSS or configurations that could help would be great! My team is using Html for this CLI tool. What would be the recommended way to handle this? I recently upgraded to Html 3.10. Is there a better approach?