.btn-sq-lg {
    width: 250px !important;
    height: 250px !important;
    }       
.pulse:hover,
.pulse:focus {
  -webkit-animation: pulse 1s;
          animation: pulse 1s;
  box-shadow: 0 0 0 2em rgba(255, 255, 255, 0);
}

@-webkit-keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 var(--hover);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 var(--hover);
  }
}
.pulse{
  --color: #a972cb;
  --hover: #cb72aa;
}