.m-midnav {
    height: 40px;
    padding: 30px 0;
  }
  .m-midnav .logo {
    height: 40px;
    width: 223px;
    background: url('https://plus-cms-bucket.ws.126.net/2018/09/26/258f3b40903c438e8e78d50628a1ea3e.png') no-repeat;
  }
  .m-midnav-right {
    float: right;
    height: 100%;
    padding-top: 2px;
  }
  .u-nav2 .li {
    border-left: none;
  }
  .m-midnav .search {
    margin-top: 3px;
    margin-right: 92px;
    position: relative;
  }
  #search-input-elem::placeholder {
    color: #999;
  }
  .search-sug-list {
    position: absolute;
    top: 32px;
    left: -1px;
    width: 347px;
    border: solid 1px #ddd;
    background: #fff;
    z-index: 800;
    display: none;
  }
  .search-sug-list ul {
    list-style: none;
  }
  .search-sug-list li {
    display: block;
    font-size: 12px;
    height: 30px;
    line-height: 30px;
    padding: 0 9px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #666;
    cursor: pointer;
  }
  .search-sug-list li:hover {
    background: #ddd;
  }
  .u-nav2 .active,
  .u-nav2 .hd-mycenter {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 800;
  }
  .m-midnav .g-container {
    width: 1180px;
  }
  .m-botnav {
    z-index: 799
  }
  .u-login {
    max-width: 100px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }
  .open-all-course{
    display: none;
    color: #333333;
    position: absolute;
    top: -30px;
    font-size: 16px;
    left: 223px;
    padding: 0 10px;
    height: 100px;
    line-height: 100px;
  }
  .open-all-course:hover{
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3)
  }
  #all-course-box{
    position: absolute;
    top: 100%;
    left: 0;
  }