.whatsapp-button {
  position: fixed;
  bottom: 15px;
  right: 15px;
  z-index: 99;
  background-color: #355136;
  border-radius: 50px;
  color: #ffffff;
  text-decoration: none;
  width: 60px;
  height: 60px;
  font-size: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  -webkit-box-shadow: 0px 0px 25px -6px rgba(0, 0, 0, 1);
  -moz-box-shadow: 0px 0px 25px -6px rgba(0, 0, 0, 1);
  box-shadow: 0px 0px 25px -6px rgba(0, 0, 0, 1);
  animation: effect 5s infinite ease-in;
}
@keyframes effect {
  20%,
  100% {
    width: 60px;
    height: 60px;
    font-size: 40px;
  }
  0%,
  10% {
    width: 65px;
    height: 65px;
    font-size: 45px;
  }
  5% {
    width: 60px;
    height: 60px;
    font-size: 40px;
  }
}