.click {
  margin: 2rem auto;
  display: flex;
  background-color: #7A5FFF;
  color: white;
  cursor: pointer;
  border: none;
  font-size: 1.2rem;
  padding: 10px 15px;
  border-radius: .25rem
}

.click {
  transition: background .8s ease-out;
  background: #7A5FFF radial-gradient(circle, transparent 1%, #7A5FFF 1%) center/15000%;
}

.click:active {
  background-color: #c1b4ff;
  background-size: 100%;
  transition: background 0s;
}