.btn-whats{
  background-color: #25D366;
  color: white;
  width: 40px;
  height: 40px;
  text-decoration: none;
  border-radius: 800px;
  padding: 30px;
  top: 85%;
  left: 3%;
  position: fixed;
  transition: all .6s;
  animation: 2s btn-whats;
  animation-fill-mode: both;
  animation-iterative-count: 1;
  z-index: 1;
}.btn-whats:hover{
  box-shadow: 0 0 20px rgba(0, 0, 0, .2);
}
.pulse{
  animation: pulse 2s infinite;
}
.btn-whats > i{
  position: relative;
  font-size: 2.9rem;
  margin: -26px -20px;
}