html,body{
    padding: 0;margin: 0;
}
.head{
    background:url(images/head_bg.jpg) ;height: 120px;width:100%;overflow: hidden;
}
.head .head-a{
    width:950px;margin: 0 auto;;
}
.head img{
    height:120px;margin:0 auto;
}

.swiper img{display: block;width: 100%;height: 100%;}

.main{
    width: 100%;overflow:hidden;
}
.main img{
    border: 0;display: block;width: 100%;height: 100%;
}