mdb-ui-kit/dist/css/ripples.css

.withripple {
  position: relative; }

.ripple-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 2px; }

.ripple {
  position: absolute;
  width: 20px;
  height: 20px;
  margin-left: -10px;
  margin-top: -10px;
  border-radius: 100%;
  background-color: rgba(0, 0, 0, 0.05);
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
  -webkit-transform-origin: 50%;
      -ms-transform-origin: 50%;
          transform-origin: 50%;
  opacity: 0;
  pointer-events: none; }

.ripple.ripple-on {
  -webkit-transition: opacity 0.15s ease-in 0s, -webkit-transform 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.1s;
          transition: opacity 0.15s ease-in 0s, transform 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.1s;
  opacity: 1; }

.ripple.ripple-out {
  -webkit-transition: opacity 0.1s linear 0s !important;
          transition: opacity 0.1s linear 0s !important;
  opacity: 0; }