gallery {
	width: 903px;
	margin: 50px auto;
}

ul {
	margin: 40px 0 0 -40px;
}

ul:hover li {
	-webkit-transition: all .2s ease-in-out;
	-moz-transition: all .2s ease-in-out;
	-o-transition: all .2s ease-in-out;
	-ms-transition: all .2s ease-in-out;
	transition: all .2s ease-in-out;
	opacity: .5;
}

ul:hover li:hover {
	opacity: 1;
}

li {
	position: relative;
	float: left;
	list-style: none;
	line-height: 0;
	padding-right: 1px;
	padding-bottom: 1px;
}

img {
	width: 300px;
	height: auto;
	cursor: pointer;
}

.overlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: none;
	background: rgba(255,255,255,.8);
	z-index: 1;
}

input[type=checkbox] {
     display: none;
}

input[type=checkbox]:checked ~ label img {
	position: fixed;
	width: 900px;
	height: 600px;
	top: 50%;
	left: 50%;
	margin-top: -300px;
	margin-left: -450px;
	box-shadow: 0 0 20px #888;
	z-index: 2;
}

input[type=checkbox]:checked ~ .overlay {
	display: block;
}

@media (max-width: 767px) {

#gallery {
text-align: center;
	}

#gallery {
	float:none;
	}
 
    
    
@media screen and (max-width: 480px) {

#gallery {
width:100%;
display:block;
margin:0.625em 0 em 0.625em 0em;
#gallery {
	float:none;
	}