.driver-popover.driverjs-theme button {
    flex: 1!important;
    text-align: center!important;
    background-color: #000!important;
    color: #ffffff!important;
    border: 2px solid #000;
    text-shadow: none!important;
    font-size: 14px!important; 
    border-radius: 6px!important;
  }