.galeria{
	/*background-color:red;*/
	position:relative;
	overflow:hidden;
	padding:0.5em;
	margin:-0.5em;
}

.galeria_imagenes{
	/*background-color:yellow;*/
	display:inline-block;
	vertical-align:top;
	width:100%;
	padding-bottom:55%;
	position:relative;
}

.galeria_imagenes a{
	display:block;
	background-color:#BBB;
	background-repeat:no-repeat;
	background-position:center center;
	background-size:cover;
	/*border:0.3em solid white;*/
	overflow:hidden;
	box-shadow:0 0 0.5em rgba(0,0,0,0.1);
	width:80%;
	height:80%;
	position:absolute;
	top:0;
	left:0;
	transition: top 1s, left 1s, opacity 1s;
}

/*.galeria_imagenes a:nth-of-type(3){
	top:10%;
	left:10%;
}

.galeria_imagenes a:nth-of-type(2){
	top:20%;
	left:20%;
}

.galeria_imagenes a:nth-of-type(1){
	top:30%;
	left:30%;
	opacity:0.2;
}*/

.galeria_flecha{
	position:absolute;
	top:0;
	height:100%;
	display: flex;
	align-items: center;
	opacity:0;
	cursor:pointer;
	transition:opacity 0.3s;
}

.galeria_flecha:hover{
	opacity:1;
}

.galeria_flecha img{
	height:3rem;
	filter: drop-shadow( 0 0 0.1em rgba(0,0,0,0.1) );
	margin:1rem;
}

.galeria_flecha_der{
	/*background-color:green;*/
	right:0;
}

.galeria_flecha_izq{
	/*background-color:blue;*/
	left:0;
}