.header {
  height: auto;
  padding: 20px 0;
  background: #fff;
}
.header .header-main {
  width: 1200px;
  height: 50px;
  margin: 0 auto;
}
.header .header-main::after {
  clear: both;
  display: block;
  content: ' ';
}
.header .logo {
  width: 260px;
  height: 50px;
  line-height: 50px;
  float: left;
  font-size: 38px;
  margin-left: 100px;
  font-weight: bold;
}
.header .nav {
  width: 840px;
  float: left;
  display: flex;
  font-size: 20px;
  align-items: center;
  position: relative;
}
.header .nav a {
  color: #fff;
  cursor: pointer;
  display: block;
}
.header .nav li {
  height: 50px;
  line-height: 50px;
  width: 20%;
  background: #073763;
  text-align: center;
  cursor: pointer;
}
.header .nav li:hover {
  background: #a0c5e8;
}
.header .nav .active {
  background: #a0c5e8;
}
#loginBtn {
  display: block;
  width: 100px;
  height: 38px;
  border-radius: 4px;
  background: #1890ff;
  color: #fff;
  text-align: center;
  line-height: 38px;
  position: absolute;
  top: 6px;
  right: 0;
  z-index: 888;
}