header {
  position: relative;
}
header .header {
  position: fixed;
  top: 0px;
  width: 100%;
  height: 80px;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 22;
  transition: top 0.2s;
}
header .header .container .logo {
  width: 200px;
  height: 40px;
}
header .header .container .nav_bar * {
  font-size: 16px;
  color: #ffffff;
}
header .header .container .nav_bar li {
  max-width: 65px;
  margin-right: 35px;
  position: relative;
}
header .header .container .nav_bar li a {
  display: block;
  height: 100%;
  position: relative;
}
.float {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: perspective(1px) translateZ(0);
  transform: perspective(1px) translateZ(0);
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-property: transform;
  transition-property: transform;
  -webkit-transition-timing-function: ease-out;
  transition-timing-function: ease-out;
}
.float:hover,
.float:focus,
.float:active {
  -webkit-transform: translateY(-20px);
  transform: translateY(-20px);
}