div.one-third {
	width: 47.5%;
}

div.one-third-second {
	margin: 0;
}

div.one-third-last {
	clear: both;
	float: none;
	width: auto;
	padding: 20px 0 0 0;
}

div.nav ul li {
	width: 25%;
	border-bottom: 1px solid #bababa;
}

@media screen and (max-width: 620px) {
	div.nav ul li {
		width: 33%;
	}
}

@media screen and (max-width: 500px) {
	
	div.nav ul li {
		width: 50%;
		font-size: 85%;
	}
	
	div.mobile-collapse {
		width: auto;
		float: none;
		margin-right: 0;
	}

		div.mobile-collapse-book {
		width: auto;
		float: none;
		margin-right: 0;
		text-align: center;
	}
		div.mobile-collapse-book  img{
		width: 45%;
		float: none;
		display: block;
		margin-right: auto;
		margin-left: auto;
		text-align: center;
	}	
	.hide-mobile {
		display: none;
	}
		
}