.header {
    background-color: #fff;
    position: fixed !important;
    height: 88px !important;
    box-shadow: 0px 14px 16px 0px rgba(153, 153, 153, 0.16);

}
.header a {
    color: #444;
    font-size: 14px;
}
.head-menu{
    margin-top: 0px !important;
}
.main{
    background-color: #f5f5f5;
    display: flow-root;
    position: relative;
    padding: 153px;
   
}
.sidebar{
    display: block !important;
}
.problem-sidebar{
    position:fixed;
    top: 152px;
    width: 320px;
    height: 598px;
    background-color: #fff;
    padding:31px 40px;
}
 .problem-sidebar div{
    font-size: 16px;
    font-weight: 600;
    color: #3A8CE7;
    line-height: 32px;
}
.problem-sidebar a{
    display: block;
    margin-top: 30px;
    font-size: 14px;
    color: #444;

}
.problem-sidebar a span:hover{
    color: #3A8CE7;
    border-bottom: 1px solid #3A8CE7;
    padding-bottom: 5px;
}
.box{
    width: 64%;
}
.box a{
    color: #3A8CE7;
    font-size: 16px;
    font-weight: bold;
}
.piece{
    margin:25px 0;
}
.piece a{
    display: block;
    font-size: 16px;
    color:#3A8CE7;
    font-weight: bold;
    margin:15px 0;
}