.gif-img {
  width: 70px !important;
  margin-bottom: 20px;
  margin-left: 10px;
  cursor: pointer;

  /* Animation */
  animation: shadowEffect 3s infinite linear;
}

@keyframes shadowEffect {
  0% {
    filter: drop-shadow(0px 0px 0px rgba(30, 255, 0));
  }
  25% {
    filter: drop-shadow(0px 0px 10px rgb(30, 255, 0));
  }
  50% {
    filter: drop-shadow(0px 0px 20px rgb(30, 255, 0));
  }
  75% {
    filter: drop-shadow(0px 0px 10px rgba(30, 255, 0));
  }
  100% {
    filter: drop-shadow(0px 0px 0px rgb(30, 255, 0));
  }
}