#wrapper, #menu, #capitulos {
	width: 700px;
} 
#wrapper {
	margin: 50px auto;
}
#menu {
	background: #dddddd;
	border:1px solid blue;
	height: 30px;
	padding-top: 10px;
	float: left;
}
#menu li {
	float: left;
	width: 33%;
	text-align: center;
}
#capitulos {
	border:1px solid red;
	margin-top:10px;
	float: left;
	height: 100px;
}
#capitulos div {
	margin: 10px 10px;
	display: none;
}