* {
 margin: 0;
 padding: 0;
}

html, body {
 width: 100%;
 height: 100%;
}

body {
 border-top: 1px solid gray;
}

.bg {
 width: 100%;
 height: 100%;
 position: fixed;
 z-index: -99;
 top: 0;
 left: 0;
 background: url('../images/index/page4/bg_page4.png');
 background-size: 100% 100%;
}

#box {
 margin-top: 100px;
}

#box p {
 text-align: center;
 font-size: 33px;
 font-family: "微软雅黑", serif;
}