header {
  overflow: unset !important;
}

@media (max-width: 640px) {
  #seminars-nav {
    /*display: block!important;*/
  }

  #seminars-nav li {
    margin: auto;
    /*width: 100%!important;*/

    border-right: none;  border-bottom: 1px solid #fff;
  }

  #seminars-nav li:last-child {
    border-bottom: 0;
  }
}