* {
	margin:0;
	padding:0;
}
body {
	position:relative;
}
.content {
	width:1200px;
	height:3000px;
	background:#f1f1f1;
	margin:0 auto;
	padding:100px 0 50px 0;
	text-align:center;
}
h1 {
	margin-bottom:500px;
}
.gongyong a {
	width:50px;
	height:50px;
	background:#000;
	color:#fff;
	position:fixed;
	text-align:center;
	line-height:50px;
	right:2%;
	text-decoration:none;
	transition:all 0.5s;
	display:none;
}
.top a {
	top:70%;
}
.bottom a {
	top:80%;
}
.gongyong a.hover {
	background:#e14da0;
}