.material-icons {
    vertical-align: middle !important;
    padding-bottom: 2px;
}

body {
    margin: 0;
    font-family: 'Open Sans', sans-serif, "Helvetica", "Arial";
    font-size: 12px;
    color: #222;
    line-height: 1.8;
}

header {
    width: 100%;
    border-bottom: 1px solid#888;
    box-shadow: 0 4px 5px 0 rgba(0, 0, 0, .14), 0 1px 10px 0 rgba(0, 0, 0, .12), 0 2px 4px -1px rgba(0, 0, 0, .2);
    display: flex;
    justify-content: center;
    font-family: 'Bitter', serif,'Open Sans',"Arial";
}

.hf-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    width: 1280px;
}

.nav-link {
    color: #222;
    border: none;
    height: 30px;
    margin-right: 10px;
    display: inline-block;
    font-size: 15px;
    font-weight: bolder;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    border-bottom:3px solid #fff;
}

.nav-link:hover {
    color: #336;
    border-bottom:3px solid #336;
}

@media screen and (max-width: 800px) {
    .headimg {
        display:none;
    
    }
  }

.page-content {
    display: flex;
    justify-content: center;
}

.main-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 15px;
    margin-bottom: 15px;
    width: 1280px;
}

.box-content {
    margin:10px;
    min-width: 200px;
    flex:1;
}

.box-content a{
    color:#236;
}

hr {
    border:0;
    background-color: #555;
    height:1px;
}

.circle_icon {
    height: 50px;
    width: 50px;
    background-color: #336;
    border-radius: 50%;
    display: inline-block;
}

.circle_icon i {
    color: #eee;
    font-size: 36px;
    margin-top: 7px;
    margin-left: 1px;
}