*{
    margin:0px;
    padding:0px;
}
ul,li{
    list-style:none;
}
a{
    text-decoration:none;
}
img{
    border:0px;
}

.a{
    width: 100%;
    height: 8.9rem;

}


.b{
    width: 100%;
    height: 34.5rem;
    background:url("../images/banner.png") no-repeat ;
    background-size: 100% 100%;

}
.c{
    background: url(../images/jishu_tu_02.png) no-repeat;
    background-size: 100% 100%;
    width: 100%;

}
.b1{
    width: 63%;
   
    margin-left: 19%;
}


.h{
    width: 100%;
    height: 29.5rem;
    background: #ebebeb;
}