@keyframes circle {
  from {
    opacity: 0.8;
    transform: scale(0);
  }
  to {
    opacity: 0;
    transform: scale(2);
  }
}
body {
  height: calc(100vh - 16px);
  display: flex;
  justify-content: center;
  align-items: center;
  background: #1c3041;
  user-select: none;
}
div {
  width: 200px;
  height: 50px;
  border-radius: 3px;
  position: relative;
  text-align: center;
  font: bold 17px/50px Verdana;
  color: #1c3041;
  background: #3abeff;
  cursor: pointer;
  overflow: hidden;
}
.circle {
  margin: -100px;
  width: 200px;
  height: 200px;
  border-radius: 100px;
  position: absolute;
  background: #1c3041;
  transform: scale(0);
  pointer-events: none;
  animation: circle 1s ease;
}