.column_single_thumb {
	margin: 20px 0;
	max-width: 540px;
	margin:0 auto;
}

.column_single_thumb img {
	width: 100%;
	height: auto;
	display: block;
}

.column_archive_thumb {
	margin-bottom: 15px;
}

.column_archive_thumb img {
	width: 100%;
	height: auto;
	display: block;
}

@media screen and (min-width: 1024px) {
#contents .column_archive  .blog_box {
        height: 640px;
    }
}