.card-footer {
  margin-top: 1rem;  
}

#select-table {
  height: 300px;
}
#select-table tbody tr {
  height: 40px;
}
#select-table th {
  border: 1px solid #fff;
  font-size: 0.8rem;
  white-space: nowrap;
}
#select-table th#conference {
  background-color: #549780;
}
#select-table thead th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1;
  background-color: #aaa !important;
}
#select-table th:first-child {
  position: -webkit-sticky;
  position: sticky;
  left: 0;
}
#select-table td {
  padding: 0;
/*  cursor: pointer; */
}
#select-table td.reserved {
  background-color: #111;
  cursor: default;
}
#select-table td:nth-child(odd) {
  border-left-style: dotted;
}
#select-table td:nth-child(even) {
  border-right-style: dotted;
}
#select-table td i {
  display: block;
  height: 40px;
  width: 20px;
}

.datepicker {
  background-color: #e9ecef !important;
  cursor: initial !important;
}

.popup {
  display: inline-block;
  margin: 0;
  padding: 0;
}
.popup #popup {
  width:50%;
  line-height:300px;
  background:#fff;
  border:1px solid #000;
  padding:0 4%;
  box-sizing:border-box;
  display:none;
  position:fixed;
  top:50%;
  left:50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
.popup img{
  width:100%;
  height: auto;
}
.popup span {
  display: inline-block;
  background-color:#01b6ed;
  color:#fff;
  width:200px;
  line-height:40px;
  border-radius:4px;
  text-align:center;
}
.popup span:hover{
  cursor:pointer;
}
.popup input[type="checkbox"]{
  display:none;
}
.popup input[type="checkbox"]:checked + #popup {
  display:block;
  z-index: 1;
}

.ui-dialog .ui-dialog-titlebar {
  padding: 0 !important;
}
.ui-dialog .ui-dialog-content {
  overflow: initial !important;
  padding: 16px !important;
}

@media screen and (max-width: 768px) {
  .popup #popup {
    width:80%;
    line-height:200px;
  }
}

.req {
  padding-left: 0.25rem;
  vertical-align: sub;
  color: red;
  font-size: 1rem;
}

#register-form #error p {
  margin: 2.5rem;
  padding: 1rem;
  border: 3px solid red;
  font-weight: bold;
  font-size: 1.25rem;
}