.ch-grid {
	margin: 20px 0 0 0;
	padding: 0;
	list-style: none;
	display: block;
	text-align: center;
	width: 100%;
}

.ch-grid:after,
.ch-item:before {
	content: '';
    display: table;
}

.ch-grid:after {
	clear: both;
}

.ch-grid li {
	width: 320px;
	height: 320px;
	display: inline-block;
	margin: 58px;
}
@media all and (max-width:1340px) {
	.ch-grid li {
		width: 320px;
		height: 320px;
		display: inline-block;
		margin: 20px;
	}
}

@media all and (max-width:450px) {
	.ch-grid li {
		width: 250px;
		height: 250px;
		display: inline-block;
		margin: 20px;
	}
}