* {
    margin: 0;
    padding: 0;
  }
  
  .header {
    display: flex;
    justify-content: space;
    vertical-align: middle;
    align-items: center;
    color: #333;
    height: 100px;
  }
  
  .logo {
    flex: 4;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .logo img {
    display: block;
    width: 66px;
    height: 66px;
    margin-right: 20px;
    border-radius: 10px;
  }

  .logo .title {
    font-size: 28px;
  } 
  
  .logo .desc {
    font-size: 16px;
  }
  
  .nav {
    flex: 6;
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
  }
  
  .nav .nav_list li {
    float: left;
    position: relative;
    width: 143px;
    height: 65px;
    line-height: 65px;
    list-style: none;
    text-align: center;
    /* border: 1px solid #ebebeb; */
  }
  
  .nav .nav_list li a {
    text-decoration: none;
    color: #333;
  }

  .main {
      height: calc(100vh - 200px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
  }


.footer {
    background-color: #333333;
    height: 100px;
    line-height: 100px;
    color: #333;
    text-align: center;
    color: #999;
    font-size: 12px;
  }