body {
	font-family: Arial, Helvetica, sans-serif;
	margin: 0;
	height: 100%;
	margin-bottom:150px;
}
header h1 {
	font-family: Arial, Helvetica, sans-serif;
	float: left;
	color: white;
	font-size: 60px;
}
header #header_content {
	width: 980px;
	margin: 0 auto;
	float:center;
}
header {

	display: block;
	width: 100%;
	margin-bottom: 30px;
	overflow: hidden;
	height: 180px;
	line-height: 10px;
}
footer {
	position: absolute;
	display: block;
	bottom:0;
	width: 100%;
	height: 50px;
}
nav {
	clear: both;
}
nav ul {
	list-style: none;
	font-family: Arial, Helvetica, sans-serif;
	float: left;
	font-size: 30px;
}
header nav ul li {
	float: left;
	margin-right: 10px;
}
nav a {
	color: white;
	text-decoration: none;
	cursor: auto;
}
#book_search {
	width: 300px;
	height: 25px;
	margin-right: 100px;
	margin-top: 45px;
	font-size: 20px;
	float: right;
	top: 10px;
	width: 300px;
}
section {
	display: block;
	clear: both;
	min-height: 100%;
	padding-top: 20px;
	text-align: center;
	width: 1000px;
	margin: 0 auto;
}
.color-top {
	background-image: linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 76%);
	background-image: -o-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 76%);
	background-image: -moz-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 76%);
	background-image: -webkit-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 76%);
	background-image: -ms-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 76%);
	background-image: -webkit-gradient(
	linear,
	left bottom,
	left top,
	color-stop(0.04, rgb(64,119,167)),
	color-stop(0.52, rgb(90,155,201)),
	color-stop(0.76, rgb(117,186,242))
	);
}
.color-bottom {
	background-image: linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 31%);
	background-image: -o-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 31%);
	background-image: -moz-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 31%);
	background-image: -webkit-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 31%);
	background-image: -ms-linear-gradient(bottom, rgb(64,119,167) 4%, rgb(90,155,201) 52%, rgb(117,186,242) 31%);
	background-image: -webkit-gradient(
	linear,
	left bottom,
	left top,
	color-stop(0.04, rgb(64,119,167)),
	color-stop(0.52, rgb(90,155,201)),
	color-stop(0.31, rgb(117,186,242))
	);
}