@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(50, 50, 50, .4); } 70% { box-shadow: 0 0 0 15px rgba(50, 50, 50, 0); } 100% { box-shadow: 0 0 0 0 rgba(50, 50, 50, 0); } }