.join_us .panel-group {
  border-radius: 0;
}
.join_us .panel {
  border-radius: 0;
  border-left: 0;
  border-right: 0;
  border-top: 0;
}
.join_us .table_title {
  clear: both;
  height: 38px;
  line-height: 38px;
  background-color: #357ebd;
}
.join_us .table_title > span {
  float: left;
  width: 25%;
  font-size: 12px;
  text-align: center;
  color: #ffffff;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  overflow: hidden;
}

.join_us .panel-heading {
  padding: 10px 0;
  box-sizing: border-box;
}

.join_us .panel-title > a {
  height: 24px;
  line-height: 24px;
  display: block;
  clear: both;
}
.join_us .panel-title span {
  float: left;
  width: 25%;
  padding: 0 4px;
  box-sizing: border-box;
  font-size: 12px;
  text-align: center;
  border-right: 1px solid #ccc;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  overflow: hidden;
}
.join_us .panel-title span:nth-of-type(1) {
  text-align: left;
  text-indent: 2px;
}
.join_us .panel-title span:nth-last-of-type(1) {
  border-right: 0;
}

.join_us .panel-group .panel + .panel {
  margin-top: 0;
}
.join_us .panel {
  border: 0;
}
.join_us .panel a i{
    display: none;
    margin-right: 2px;
}
.join_us .panel a[aria-expanded="true"] .fa-angle-double-up{
    display: inline-block;
}

.join_us .panel a[aria-expanded="false"] .fa-angle-double-down{
    display: inline-block;
}