*{
	margin: 0;
	padding: 0;
}
html,body{
	min-width: 1200px;
	background-color: #ededed;
}
img{
	display: block;
	width: 100%;
}
.book_cen{
	width: 1170px;
	margin: 100px auto;
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
}
#flipbook{
	margin: 0 auto;
	overflow: hidden;
}
#flipbook{
	width:1152px;
	height:752px;
}
#flipbook .turn-page{
	background-color:#ccc;
	background-size:100% 100%;
}

.top,.dow{
	width: 40px;
	height: 40px;
	position: absolute;
	top: 0;
	bottom: 0;
	margin: auto;
}
.top{
	left: 0px;
}
.dow{
	right: 0;
}