.button {
  width: 200px;
  padding: 20px 40px;
  position: relative;
  display: block;
  text-decoration: none;
  overflow: hidden;
  border: 0;
  cursor: pointer;
  border-radius: 2rem;
  box-shadow: 0 0 5px 0px rgba(0, 0, 0, 0.5);
}

.button:hover .wave {
  top: -120px;
}

.text {
  position: relative;
  z-index: 1;
  color: white;
  font-size: 15px;
  letter-spacing: 3px;
  font-weight: 600;
}

.wave {
  width: 200px;
  height: 200px;
  background-color: #27a9ff;
  box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.5);
  position: absolute;
  left: 0;
  top: -70px;
  transition: 0.4s;
}

.wave::before, a .wave::after {
  width: 200%;
  height: 200%;
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -75%);
}

.wave::before {
  border-radius: 45%;
  background-color: #0581b3;
  animation: wave 5s linear infinite;
}

.wave::after {
  border-radius: 40%;
  background-color: rgba(20, 20, 20, 0.5);
  animation: wave 10s linear infinite;
}

@keyframes wave {
  0% {
    transform: translate(-50%, -75%) rotate(0deg);
  }

  100% {
    transform: translate(-50%, -75%) rotate(300deg);
  }
}