body {
    text-align: center;
    filter: drop-shadow(2px 2px 3px #505050);
    animation: pulse 3s infinite;
}
.fqdn {
    margin: 40px;
    font-family:Anta;
    font-size: 80px;
}

@keyframes pulse {
  0%, 100% {
    #background-color: #383838;
    filter: drop-shadow(2px 2px 3px #505050);
  }
  50% {
    #background-color: #343434;
    filter: drop-shadow(2px 2px 3px #507070);
  }
}