.upper_top,.upper_down{
	position: fixed;
	right: 50px;
	bottom: 70px;
	width:40px;
	height:40px;
	line-height: 40px;
	background:#d4caca;
	border:1px solid #d4caca;
	text-align: center;
	border-radius: 50%;
}
.upper_down{
	bottom: 20px;
}
.upper_top:hover,.upper_down:hover{
	cursor: pointer;
	background:#ef7b7b;
}
.upper_top img,.upper_down img{
	width:20px;
	vertical-align: middle;
}
.upper_down img{
	width: 24px;
}