.button-whats {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  color: #fff;
  border-radius: 50%;
  font-size: 30px;
  text-align: center;
  box-shadow: 1px 1px 2px #888;
  z-index: 1000;
  cursor: pointer;
  outline: none;
  transition: all 0.3s ease-in-out;
  display: flex;
  align-items: center;
  justify-content: center;
}

.button-whats i {
  margin-top: 16px;
}

.button-whats::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 100px;
  border: 6px solid #00ffcb;
  box-shadow: 0 0 60px rgba(0, 255, 203, 0.64);
  width: calc(60px + 12px);
  height: calc(60px + 12px);
  opacity: 0;
  transition: all 0.3s ease-in-out;
}

.button-whats:hover,
.button-whats:focus {
  color: white;
  transform: translateY(0px);
}

.button-whats:hover::before,
.button-whats:focus::before {
  opacity: 1;
}

.button-whats::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 30px;
  height: 30px;
  border-radius: 100%;
  border: 6px solid #00ffcb;
  animation: ring 1.5s infinite;
  z-index: -1;
}

.button-whats:hover::after,
.button-whats:focus::after {
  animation: none;
  display: none;
}

@keyframes ring {
  0% {
    width: 30px;
    height: 30px;
    opacity: 1;
  }
  100% {
    width: 100px;
    height: 100px;
    opacity: 0;
  }
}