Whenever I click the button to open the modal window, it just pops up without any animation or fade effect.
I attempted to add classes like .fade and .modal-fade to the modal, but nothing changed.
You can see it in action on my test page. Simply click the "Jobb árat szeretnék" button.
<div class="modal modal-fade fade" tabindex="-1" role="dialog" id="AjanlatkeresModal" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Notification</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body" style="padding-bottom:0">
<p id="cart_added_msg"></p>
<p id="cart_not_added_msg"></p>
</div>
<div class="modal-footer">
<button type="submit" id="kerdesButton" class="btn btn-primary"><a href="<?php echo $host; ?>/ajanlatkeres" title="Proceed to quote request">Proceed to quote request</a></button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>