.center {
  display: inline;
  justify-content: flex-start;
  align-items: center;
}

.center2 {
  display: inline-block;
  justify-content: center;
  align-items: stretch;
}

.pulse:hover {
  animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
  0% {
    box-shadow: 0 0 0 2px rgba(255, 0, 0, 1);
  }
  100% {
    box-shadow: 0 0 0 20px rgba(0, 0, 0, 0);
  }
}

.pulse2:hover {
  animation: pulse2-animation 2s infinite;
}

@keyframes pulse2-animation {
  0% {
    box-shadow: 0 0 0 0px rgba(0, 0, 255, 1);
  }
  100% {
    box-shadow: 0 0 0 20px rgba(0, 0, 0, 0);
  }
}

.pulsespec:hover {
  animation: pulsespec-animation 5s infinite;
}

@keyframes pulsespec-animation {
  0% {
    box-shadow: 0 0 0 0px rgba(0, 0, 255, 1);
  }
  100% {
    box-shadow: 0 0 0 100px rgba(0, 0, 0, 0);
  }
}