a[href="https://api.whatsapp.com/send?phone=79842702981"] > .wa:not(:hover):before,
a[href="https://api.whatsapp.com/send?phone=79842702981"] > .wa:not(:hover):after
{
  content: " ";
  display: block;
  position: absolute;
  border: 50%;
  border: 1px solid #d84a46;
  /*цвет анимированных волн от кнопки*/
  left: -20px;
  right: -20px;
  top: -20px;
  bottom: -20px;
  border-radius: 50%;
  animation: animate 1.5s linear infinite;

  opacity: 0;
  backface-visibility: hidden;

  transition: all 0.1s ease-out;
}

a[href="https://api.whatsapp.com/send?phone=79842702981"] > .wa:not(:hover):after
{
  animation-delay: 0.5s;
}

@keyframes animate {
  0% {
    transform: scale(0.5);
    opacity: 0;
  }

  50% {
    opacity: 1;
  }

  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}