body{
    background-color: #F7F7F7;
}
.af1{
    width: 100%;
    min-height: 940px;
}
main h2{
    padding:20px 0px;
    font-size: 40px;
    letter-spacing: 0.25em;
    margin-left: 30px;
    margin-top: 30px;
}
.box{
    width: 1280px;
    height: 700px;
    margin: 20px auto;
}
.bd{
    width: 1280px;
    height: 550px;
}
.box .hd{
    margin-top:10px ;
    height: 107px;
}
.box .hd span{
    display: block;
    float: left;
    width: 210px;
    height: 107px;
    margin: 0 15px;
}
.box .hd span.cur{
    border: 1px solid black;
}
.box .bd_inn{
    width: 1280px;
    height: 550px;
    display: none;
}
.box .bd_inn.cur{
    display: block;
}