html body .header {
  background-color: rgba(0, 0, 0, 0.5);
  position: fixed;
  width: 100%;
  z-index: 10;
}
html body .header div.nav {
  display: flex;
  align-items: center;
  padding: 0 3.5625rem;
}
html body .header div.nav span.nav_title {
  margin-left: 1.6875rem;
  font-size: 33px;
  font-weight: 400;
  color: #ffffff;
}
html body .header div.nav div.nav_lab {
  font-size: 16px;
  font-weight: 400;
  color: #ffffff;
  margin-left: 10.2%;
  position: relative;
  cursor: pointer;
}
html body .header div.nav div.nav_lab .title {
  height: 100px;
  display: flex;
  align-items: center;
  white-space: nowrap;
}
html body .header div.nav div.nav_lab ul {
  display: none;
  background-color: rgba(0, 0, 0, 0.5);
  min-width: 83px;
  padding: 10px 22px;
  margin-top: 0;
  list-style: none;
  position: absolute;
  left: -1.375rem;
}
html body .header div.nav div.nav_lab ul li {
  padding: 5px 0;
  white-space: nowrap;
}
html body .header div.nav #lab1 {
  margin-left: 16.35%;
}
html body .header div.nav .lang {
  margin-left: 7.45%;
}
html body .header .lang_box {
  height: 100px;
  display: flex;
  align-items: center;
}
html body .header .lang_box ul {
  top: 100px !important;
}