.ch-grid {
	margin: -24px 0 0 0;
	padding: 0;
	list-style: none;
	display: block;
	text-align: center;
	width: 100%;
}

.ch-grid li {
    width: 130px;
    height: 130px;
    display: inline-block;
    margin: 20px;
    margin-top: 50px;
}

.ch-grid li:hover {
opacity: 0.8;
-moz-opacity: 0.5;
filter:alpha(opacity=50);

}