.article_box {
	width:25%;
}

@media only screen and (max-width:1232px) {

.article_box {
	width:33.33%;
}

}

@media only screen and (max-width:816px) {

.article_box {
	width:50%;
}

}

@media only screen and (max-width:593px) {

.article_box {
	width:100%;
}

}