.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,.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}