.img_zoom {
	width:100%; 
	overflow:hidden;
}

.img_zoom a {
	position:relative; 
	float:left;
}

.img_zoom a span::before { 
	color: #fff;
    content: "\f00e";
    display: inline-block;
    font-family: FontAwesome;
}

.img_zoom a span {
    background: rgba(0, 0, 0, 0.2) none repeat scroll 0 0;
	border-radius: 4px;
    font-size: 24px;
    height: 40px;
    left: 30px;
	display: none;
    line-height: 40px;
    margin: -20px 0 0 -20px;
    position: absolute;
    text-align: center;
    top: 30px;
    transition: color 0.15s ease 0s, background 0.15s ease 0s, opacity 0.15s ease 0s, border 0.15s ease 0s;
    width: 40px;
	cursor:pointer;
}