.modal {
      text-align: center;
      padding: 0!important;
    }
    .modal:before {
      content: '';
      display: inline-block;
      height: 100%;
      vertical-align: middle;
      margin-right: -4px;
    }
    .modal-dialog {
      display: inline-block;
      text-align: left;
      vertical-align: middle;
    }
    .btn-lg{
      width: 550px;
      margin: 5px;
    }
    .sm{
      width: 350px;
      margin: 5px;
    }