body {
  background: #020438;
  font: 14px/1 "Open Sans", helvetica, sans-serif;
}

.box {
  height: 280px;
  width: 280px;
  position: absolute;
  top: 50%;
  left: 50%;
  /* transform: translate(-50%, -50%); */
  background: #020438;
  border-radius: 100%;
  overflow: hidden;
}

.box .water {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  transform: translate(0, 90%);
  background: #4D6DE3;
  transition: all 0.3s;
}

.box .water_wave {
  width: 200%;
  position: absolute;
  bottom: 100%;
}

.box .water_wave_front {
  left: 0;
  fill: #4D6DE3;
  margin-bottom: -1px;
  -webkit-animation: wave-front 0.7s infinite linear;
  animation: wave-front 0.7s infinite linear;
}

@-webkit-keyframes wave-front {
  100% {
    transform: translate(-50%, 0);
  }
}

@keyframes wave-front {
  100% {
    transform: translate(-50%, 0);
  }
}