Bootstrap modal doesn't displays

Question

The demo is here: http://obuh.by/test/lime/

The problem is when I try to display the modal on button «Показать», it appears and disappears immediately.

Answer 1

Change the type of button from submit to button, right now you submit the form and page reloads:

<button data-toggle="modal" data-target="#requestModal" type="button" class="btn btn-lg btn-block btn-main btn-warning">Показать</button>