.col-md-3 {
    padding-top: 20px;
    padding-bottom: 20px;
}

.row {
    align-items: center;
}

h6 {
    text-align: center;
}

.col-md-3 a img {
	opacity: 1;
	-webkit-transition: .3s ease-in-out;
	transition: .3s ease-in-out;
}
.col-md-3 a:hover img {
	opacity: .5;
}