Zoom in icon on hover
.photo a:after {
position: absolute;
content: '';
width: 100%;
height: 100%;
top: 0;
left: 0;
opacity: 0;
background: url('../img/zoom-in.png') no-repeat center bottom rgba(61, 73, 79, 0.49);
}
.photo a:hover:after {
background-position: center center;
opacity: 1;
}