Changes

.category:hover {box-shadow: 0 1px 2px rgba(0,0,0,0.15); -webkit-box-shadow: 0 1px 2px rgba(0,0,0,0.15); transition: box-shadow 0.3s ease-in-out;}

.architecture { display: block; margin: 25px auto 0 auto; text-a lign: center; background-image: url(architecture.png); width: 70px; height: 70px; }

.communications {display: block; margin: 25px auto 0 auto; text-align: center; background-image: url(communications.png); width: 70px; height: 70px; }

.integration { display: block; margin: 25px auto 0 auto; text-align: center; background-image: url(integration.png); width: 70px; height: 70px;}