*{ margin:0px; padding:0px;}
body 
{
    line-height:1.5;
    font-family:微软雅黑;
}
a{ text-decoration:none;}
ul,li{ list-style:none; }


.gallery {
	display:flex;
	flex-wrap: wrap;
	max-width:1200px;
	margin:50px auto;
	justify-content: space-between;
}
.gallery-item {
	flex: 0 0 24%;
}
.gallery-item img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	object-position: center;
}


.lightbox {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	pointer-events: none;
	opacity: 0;
}
.lightbox.active {
	opacity: 1;
	pointer-events: initial;
}
.lightbox-back {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(0,0,0,0.8);
	cursor: pointer;
}
.lightbox-content {
	position: absolute;
	top: 50%;
	left: 50%;
	max-height: calc(100% - 6em);
	max-width: calc(100% - 6em);
	transform: translate(-50%,-50%);
}
.lightbox-content img {
	max-width: 100%;
	max-height: 100%;
}
.lightbox-content::after {
	content: '\000D7';
	position: absolute;
	top: -2em;
	right: -2em;
	width: 2em;
	height: 2em;
	line-height: 2em;
	text-align: center;
	background-color: #fff;
	box-shadow: 1px 1px 3px rgba(0,0,0,0.2);
	border-radius: 2em;
	pointer-events: none;
}