.ch-grid { margin: 20px 0 0; padding: 5% 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;
}



.main{
	width: 100%;
	margin: 0 auto;
	position: relative;
}
@media only screen and (max-width:480px) {
.ch-grid li {
	width: 220px;
	height: 220px;
	display: inline-block;
	margin: 5px;
}
}
@media only screen and (min-width: 481px) {

.ch-grid li {
	width: 220px;
	height: 220px;
	display: inline-block;
	margin: 20px;
}
}
@media only screen and (min-width: 769px) {
.ch-grid li {
	width: 220px;
	height: 220px;
	display: inline-block;
	margin: 5px;
}
}