.ban1{ height:400px; }
.ban1 a{ display:block; height:400px;}
.bgitem {position:absolute;}
.btn { bottom: 50px;
    margin-right: -500px;
    padding: 4px 4px;
    position: absolute;
    right: 50%;
    top: 518px;
    z-index: 7;
	font-family:"Microsoft Yahei";
}
.btn span {
    background: none repeat scroll 0 0 #FFF;
    border: 1px solid #FFF;
    color: #111;
    cursor: pointer;
    display: inline-block;
    margin-left: 5px;
    padding: 0 8px;
}