.top-box-fixed {
    width: 100%;
    position: fixed;
    top: 0px;
    left: 0px;
    background-color: #FFF;
    z-index: 9999;
}
.topbox_pad{
  padding: 15px 15px 5px 15px;  
}
.header-body {
    position: relative;
    background-color: #fff;
}
.header-body .header {
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
    height: 50px;
    padding: 0 50px;
    box-sizing: border-box;
}
.header-body .back, .header-body .back:before {
    position: absolute;
    right: auto;
    bottom: auto;
    z-index: 10;
    display: block;
}
.header-body .back {
    top: 5px;
    left: 5px;
    width: 40px;
    height: 40px;
    overflow: hidden;
}
.header-body .back:before {
    top: 13px;
    left: 16px;
    content: "";
    width: 12px;
    height: 12px;
    border-width: 0 0 2px 2px;
    border-color: #888;
    border-style: solid;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}
.header-body .back, .header-body .back:before {
    position: absolute;
    right: auto;
    bottom: auto;
    z-index: 10;
    display: block;
}
.header-body .title {
    font-size: 16px;
    color: #333;
    line-height: 1.2;
    font-weight: normal;
}
.header-body .menu {
    position: absolute;
    top: 5px;
    right: 5px;
    bottom: auto;
    left: auto;
    z-index: 10;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 18px;
    color: #666;
    line-height: 1;
}
.header-body .menu span {
    background-size: 24px;
    background-repeat: no-repeat;
}
.top-img{
    position: relative;
    margin-top:50px;
}