@media (max-width: 767px) {
  .btn{background-image: none}
  .btn:hover{background-image: none !important}
  .modal.modal-fullscreen .modal-dialog .modal-content .modal-header .close, .bootstrap-fs-modal .modal .modal-dialog .modal-content .modal-header .close {
    margin-right: 0px;
    min-width: 40px;
  }
  .modal.modal-fullscreen .modal-dialog .modal-content .modal-header .close:before, .bootstrap-fs-modal .modal .modal-dialog .modal-content .modal-header .close:before {
    border: none;
    display: inline;
  }
}