#whatsapp .wtsapp {
  position: fixed;
  transform: all 0.5s ease;
  background-color: #25d366;
  display: block;
  text-align: center;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
  border-radius: 50px;
  color: #fff;
  font-weight: 700;
  font-size: 30px;
  bottom: 70px;
  left: 20px;
  border: 0;
  z-index: 9999;
  width: 50px;
  height: 50px;
  line-height: 50px;
}

#whatsapp .wtsapp:before {
  content: "";
  position: absolute;
  z-index: -1;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  display: block;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  border-radius: 50%;
  -webkit-animation: pulse-border 1500ms ease-out infinite;
  animation: pulse-border 1500ms ease-out infinite;
}
#whatsapp .wtsapp:focus {
    border: none;
    outline: none;
}

@keyframes pulse-border {
    0%{transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1); opacity: 1;}
    100%{transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1.5); opacity: 1;}
}