*{
  margin: 0;
  padding: 0;
  font-family: "Microsoft YaHei";
  font-weight: normal;
}
header {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  z-index: 9;
  width: 100%;
  height: 68px;
  background-color: #fff;
  box-shadow:0px 0px 6px 0px rgba(0, 0, 0, .1);
}
.logo {
  float: left;
  width: 124px;
  height: 68px;
  padding-top: 16px;
}
.logo img {
  width: 100%;
}
.nav-ul {
  float: right;
}
.nav-li {
  float: left;
  position: relative;
  width: 100px;
  height: 68px;
  text-align: center;
}
.nav-li a {
  font-size: 16px;
  color: #4a4a4a;
  line-height: 68px;
}
.nav-li a.active:after,
.nav-li a.m-active:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  margin-left: -30px;
  width: 60px;
  height: 3px;
  background-color: #3f63f6;
}
#mb-nav,
.m-nav-ul{
  display: none;
}
@media(max-width: 767px) {
  header {
    display: none;
  }
  #mb-nav {
    display: block;
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    z-index: 9;
    background-color: #fff;
  }
  .mb-nav-t {
    padding: 0 12px;
    height: 60px;
    border-bottom: 1px solid #797979;
  }
  .logo{
    height: 60px;
    padding-top: 10px;
  }
  .logo img{
    width: auto;
    height: 40px;
  }
  .m-menu {
    float: right;
    margin: 19.5px 0 0 0;
    width:25px;
    height:21px;
    cursor:pointer;
  }
  .m-menu span {
    width:25px;
    height:3px;
    background:#0f1f5a;
    display:block;
    margin-bottom:6px;
    transition:all .5s;
    -webkit-transition:all .5s;
    transform-origin:0px center;
  }
  .m-menu span:nth-child(3){
    margin-bottom: 0;
  }
  .icon1 {
    transform:rotate(45deg);
  }
  .icon2 {
    width:0;
    opacity: 0;
  }
  .icon3 {
    transform:rotate(-45deg);
  }
  .m-nav-ul {
    display: none;
    position: fixed;
    width: 100%;
    top: 60px;
    left: 0;
    padding: 0 12px;
    background-color: #fff;
    z-index: 9;
    box-shadow: 0 10px 60px #cccccc;
  }
  .m-nav-li {
    width: 100%;
    height: 40px;
    border-bottom: 1px dashed #797979;
  }
  .m-nav-li a {
    font-size: 16px;
    line-height: 40px;
    color: #ccc
  }
  .m-nav-li a.active{
    color: #000;
  }
}