#banner {
	margin-top: 0px;
	position: relative;
}

#banner .contenedor{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translateX(-50%) translateY(-50%);
	color: #000;
} 
#banner h2{
	font-size: 30px; /*letra*/
	text-align: center;
}

#banner a{
	display: block;
	width: 100px;
	color: #000;
	text-decoration: none;
	padding: 10px;
	margin-top: 10px;
	border: 3px solid #000;
	text-align: center;
}
#banner a:hover{
	background: rgba(51,51,51,0.3 );
}
.atras {
	
	width: 100px;
	color: #000;
	text-decoration: none;
	padding: 10px;
	margin-top: 10px;
	border: 3px solid #000;
}
.atras :hover{
	background: rgba(51,51,51,0.3 );
}
#desplazar{
	display: none;
}
#leer:hover{
	cursor: pointer;
	background: rgba(0,0,255,0.2);
	color:#000000;
}
.libro {
	
	width: 150px;
	color: #000;
	text-decoration: none;
	padding: 10px;
	margin-top: 10px;
	border: 3px solid #000;
}
.libro :hover{
	background: rgba(51,51,51,0.3); 
}


@media (max-width: 500px){
	#banner{
		padding-top: 4rem;
		padding-bottom: 4rem;
	}
}
@media (max-width: 1300px){
	#banner{
		height: 500px;
		overflow: hidden;
	}
}
@media (max-width: 800px){
	.atras{
		
		display: block;
	   overflow: hidden;
	}
}