body {
	padding: 0;
	margin: 0;
}

.img {
	display: block;
	margin: 20px auto;
	width: 100%;
	max-width: 960px;
}

.img:hover {
	cursor: pointer;
}

#gallery-1 {
	display: none;
}

#gallery-2 {
	display: none;
}

.universal-gallery {
	width: 100%;
	height: 100%;
	background-color: rgba(0, 0, 0, 0.8);
	position: fixed;
	top: 0px;
	display: flex;
	align-items: center;
    z-index: 1000;
}

.container-gallery {
	display: block;
	margin: auto;
	width: 50%;
	background-color: rgba(0, 0, 0, 0.9);
	padding: 10px 10px 10px 10px;
	color: white;
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
    
}

.images-universal {
	width: 100%;
}

.arrows {
	position: absolute;
	width: 40px;
	height: 40px;
}

.arrows:hover {
	cursor: pointer;
	transition: 1s;
	filter:invert(10%);
}

.back {
	top: 50%;
	left: 3%;
}

.next {
	top: 50%;
	right: 3%;
}

.exit {
	right: 3%;
}


@media (max-width: 900px) {

	.container-gallery {
		width: 60%;
	}
}

@media (max-width: 640px) {

	.container-gallery {
		width: 70%;
	}

	.arrows {
		width: 30px;
		height: 30px;
	}

	.back {
		top: 50%;
		left: 2%;
	}
	
	.next {
		top: 50%;
		right: 2%;
	}
	
	.exit {
		right: 2%;
	}
}