* {
    margin: 0;
    padding: 0;
}
body {
    font-family: "幼圆";
    font-size: 12px;
    color: #666;
    background-image:url("../img/beijingqiang.jpg");
    background-size: 100% 100%;
}
.hidden {
    display: none;
}
h1 {
    margin-top: 50px;
    text-align: center;
}
.wrap {
    width: 1000px;
    height: 500px;
    margin: 50px auto;
    /*background-image:url("../img/beijing.jpg");*/
    position: relative;
    /*overflow: hidden;*/
    perspective: 1000px;
    -webkit-perspective: 1000px;
}
.photo {
    width: 250px;
    height: 250px;
    z-index: 1;
    position: absolute;
    top: 0;
    left: 0;
    transition: all 2s;
    -webkit-transition: all 2s;
    -moz-transition: all 2s;
    /*background: url("../img/qiang1.jpg");*/
}
.photo-center {
    top: 50%;
    margin-top: -100px;
    left: 50%;
    margin-left: -75px;
    z-index: 999;
}
/*.photo-current {
	transform: rotateY(180deg);
}*/
.photo-wrap {
    height: 100%;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    transition: all ease-in .5s;
    -webkit-transition: all ease-in .5s;
    -moz-transition: all ease-in .5s;
}
.photo-wrap:hover {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
}
.photo-wrap .side-common {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    text-align: center;
    line-height: 200px;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
    border-radius: 9px;
    padding: 10px;
    background: white;
    box-sizing: border-box;
    backface-visibility: hidden;
    -webkit-backface-visibility:hidden;	/* Chrome �? Safari */
    -moz-backface-visibility:hidden; 	/* Firefox */
    -ms-backface-visibility:hidden;		/* Internet Explorer */
}
.photo-wrap .side-front {
    background: white;
    color: black;
    overflow: hidden;
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    -moz-transform: rotateY(0deg);
}
.photo-wrap .side-back {
    background:rgba(0,0,0,0.6);
    color: white;
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    font-size: 22px;
}
.return{
    position: fixed;
    bottom: 50px;
    right: 50px;
    width: 80px;
    height: 30px;
    text-align: center;
    color: #fff;
    font:12px/30px "宋体";
    border: 1px solid #ccc;
    background: rgba(0,0,0,0.4);
    cursor: pointer;
    text-decoration: none;
}