.y-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.md-tab .tab-nav ul {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: justify;
  justify-content: space-between;
  flex-wrap: wrap;
}

.md-tab .tab-nav ul li {
  display: inline-block;
  -webkit-box-flex: 1;
  flex-grow: 1;
  text-align: center;
  border-bottom: 2px solid #dddddd;
  padding-bottom: 14px;
}

.md-tab .tab-nav ul li a {
  display: block;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  color: #999999;
  display: flex;
  display: -ms-flexbox;
  display: -webkit-flex;
  align-items: center;
  justify-content: center;
  -ms-flex-pack: center;
  justify-content: flex-start;
  align-items: center;
  justify-content: center;
  text-align: center;
  word-break: keep-all;
  word-wrap: break-word;
}

.md-tab .tab-nav ul li.active {
  border-bottom: 2px solid #ff5000;
}

.md-tab .tab-nav ul li.active a {
  color: #ff5000;
}

.md-tab .tab-nav ul li:hover a {
  color: #ff5000;
}

.md-tab .tab-nav ul li:first-child:nth-last-child(2),
.md-tab .tab-nav ul li:first-child:nth-last-child(2) ~ li {
  width: 50%;
}

.md-tab .tab-nav ul li:first-child:nth-last-child(3),
.md-tab .tab-nav ul li:first-child:nth-last-child(3) ~ li {
  width: 33.3%;
}