#pc_archive{
	width: 70%;
	margin: 0 auto;
}

.pc_archive_contentbox{
	-webkit-column-count: 4;	
	-webkit-column-gap: 20px;
	-webkit-column-fill: balance;
	-moz-column-count: 5;
	-moz-column-gap: 25px;
	-moz-column-fill: balance;
	column-count: 5;
	column-gap: 25px;
	column-fill: balance;
	margin-top: 30px;
}

.pc_archive_contentbox a{
	display: inline-block;
	-webkit-break-inside: avoid;
	-moz-break-inside: avoid;
	break-inside: avoid;
	box-shadow: 0px 0px 17px 5px rgba(182, 167, 167, 0.3);
	margin-bottom: 25px;
}

.pc_archive_contentbox a:last-child{
	margin-right: 0px;
}

.pc_archive_contentbox a img{
	width: 100%;
	height: auto;
}

.pc_archive_contentbox video{
	width: 100%;
	height: auto;
}



@media screen and (max-width: 769px) {
	#pc_archive{
		width: 90%;
		margin: 0 auto;
	}

	.pc_archive_contentbox{
		-webkit-column-count: 2;	
		-webkit-column-gap: 15px;
		-webkit-column-fill: balance;
		-moz-column-count: 2;
		-moz-column-gap: 15px;
		-moz-column-fill: balance;
		column-count: 2;
		column-gap: 15px;
		column-fill: balance;
		margin-top: 30px;
	}
}