#kefu{
	position: fixed;
    right: 5px;
    top: 50%;
    z-index: 10;
    width: 35px;
    height: 35px;
    margin-top: -18px;
    border-radius: 100px;
    overflow: hidden;
}
#kefu a{
	display: inline-block;
	float: left;
	width: 100%;height: 100%;
}
#kefu img{
	width: 100%;
	height: 100%;
}