/*浮动的top*/
.top{
    width: 1000px;
    position: fixed;
    left: 50%;
    margin-left: -500px;
    /*border:1px solid red;*/
    z-index: 10;
    bottom: 45px;
    display: none;
}
.top>img{
    position: absolute;
    right:-80px;
    top:-30px;
}
.top>img:hover{
    cursor: pointer;
}
@media screen and (max-width:1366px ){
    .top>img{
        width: 48px;
        right: -70px;
    }
}