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Bootstrap modal appearing under background

html
responsive-design
z-index
css
Anton ShumikhinbyAnton Shumikhin·Nov 23, 2024
TLDR

Boost the z-index of your Bootstrap modal and .modal-backdrop to fix the issue:

.modal-backdrop { z-index: 1040; /* "I'm on top of the world!" */ } .modal { z-index: 1050; /* "Get in line, buddy. I'm the star here!" */ }

This CSS snippet ensures that the modal hovers over other elements and is not hidden.

Inspect element positioning

Your modal should not be nested within an element styled with position: fixed or position: relative;. These positions can mess with the modal's display. If possible, place the .modal div just before your closing body tag (</body>).

Understanding z-index stacking

Remember z-index only affects positioned elements (position: absolute, position: relative, or position: fixed). position: static;, the default, doesn't count. Check that your modal or its parent isn't static.

Version check-up

Ensure your Bootstrap CSS and JS versions match. No squabbling siblings allowed; inconsistent versions can lead to unpredictable modal behavior.

Other potential solutions

Appending the modal to the body

If your modal prefers to live life on the edge (of the webpage), you can use jQuery:

$(".modal").appendTo("body"); // "Who needs parents, when you've got the <body>?"

This field trip moves the modal above the body, often dusting off old z-index dust-bunnies.

Removing conflicting CSS

Bad CSS, bad! If elements around the modal have naughty position properties, remove or override them. But remember, don't make the rest of your page pay for one element's errors.

Role of data-backdrop attribute

Using data-backdrop with a value of "false" removes the modal backdrop – it might seem harsh, but sometimes tough love is the answer.

<div class="modal" data-backdrop="false"> <!-- Modal content --> </div>

More ways to fix overlay issues

Repositioning the modal div

Escape the z-index stacking context by moving the modal div outside hazardous elements. Your modal needs room to breathe!

<!-- Move this line to just before the closing body tag --> <div class="modal" ...></div> </body>

Embracing Bootstrap updates

Out with the old, in with the updated. Sometimes the simple solution is to upgrade Bootstrap to the latest stable version – it's like a spa day, but for your code.