.navbar{
    box-shadow: 2px 2px 5px darkslategrey;
    opacity: .9;   
}

.navbar .nav-item .nav-link{
    color: white; 
}

.form-control, .btn{
    border-radius: 0;

}

#id_book{
    background: rgb(34, 47, 62);
}

footer{
    background: darkslategrey;
}

.datos_consultas{
    background: rgb(255, 159, 67);
}
.accordion-button{
	position: static;
}

/* book */
book form {
	width: 100%;
	display: flex;
	justify-content: center;
	margin-bottom: 20px;
}

book .barra-busqueda {
	width: 70%;
	height: 40px;
	line-height: 40px;
	background: #fff;
	padding: 0 20px;
	border-radius: 100px;
	border: none;
	text-align: center;
	font-size: 16px;
}

book .categorias {
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
}

book .categorias a {
	color: #9B9B9B;
	margin: 10px 20px;
	font-size: 18px;
	font-weight: 700;
}

book .categorias a.activo {
	color: orange;
}

/* grid */
.grid {
	position: relative;
	width: 50%;
	opacity: 0;
	transition: opacity 0.5s linear 1s;
    margin: auto;
}

.grid.imagenes-cargadas {
	opacity: 1;
}

.grid .item {
	position: absolute;
	display: block;
	padding: 0;
	margin: 10px;
	width: calc(33.333333% - 20px);
}

.grid .item-contenido {
	position: relative;
}

.grid .item img {
	width: 100%;
	cursor: pointer;
	vertical-align: top;
}

/* Overlay */
.overlay {
	position: fixed;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	background: rgba(0,0,0,.9);
	width: 100%;
	height: 100vh;
	display: none;
	align-items: center;
	justify-content: center;
	flex-direction: column;
}

.overlay.activo {
	display: flex;
}

.overlay img {
	max-width: 100%;
}

.overlay .descripcion {
	display: block;
	background: #fff;
	padding: 20px;
	text-align: center;
	margin-top: 5px;
	border-radius: 10px;
	max-width: 50%;
}

.contenedor-img {
	position: relative;
}

.overlay #btn-cerrar-popup {
	background: none;
	font-size: 20px;
	color: #fff;
	border: none;
	cursor: pointer;
	position: absolute;
	right: -20px;
	top: -20px;
}


/* Footer */
footer .redes-sociales {
	display: flex;
	align-content: center;
	justify-content: center;
	padding: 20px;
	flex-wrap: wrap;
}

footer .redes-sociales a {
	display: block;
	width: 60px;
	height: 60px;
	background: #000;
	color: #fff;
	margin: 20px;
	text-align: center;
	border-radius: 100px;
	transition: .3s ease all;
}

footer .redes-sociales .twitter {background: #1da1f2;}
footer .redes-sociales .facebook {background: #155df8;}
footer .redes-sociales .instagram {background: #ee3c3c;}

footer .redes-sociales a i {
	font-size: 20px;
	line-height: 60px;
}

footer .contenedor-icono:hover a {
	animation: icono .5s ease;
}

@keyframes icono {
	from {
		transform: rotate3d(0,0,0,0);
	}
	to {
		transform: rotate3d(0,1,0, 360deg);
	}
}

@media screen and (max-width: 700px) {
	.grid .item {
		width: calc(50% - 20px);
	}

	header .barra-busqueda {
		width: 100%;
	}
}