modify the modal cross button bootstrap 4 code example

Example 1: bootstrap modal lg extra

@media (min-width: 768px) {
  .modal-xl {
    width: 90%;
   max-width:1200px;
  }
}

Example 2: bootstrap 3 modal close only with button

<--! Add following to modal Div : data-backdrop='static' -->
<div id="modal" class="modal hide fade in" data-keyboard="false" data-backdrop="static">