.group {
width: 90%;
margin: 0 auto;
}

.photo-group {
height: 100px;
width: auto;
margin: 15px;
}

.photo-group:hover {
transform : rotate(0deg);
transform : scale(2.5);
z-index : 10;
box-shadow : 0 10px 20px rgba(0, 0, 0, 0.7);
}