.outer {
  position: absolute;
  top: 50%;
  left: 50%;
  height: 400px;
  width: 400px;
  margin-top: -200px;
  margin-left: -200px;
  border-radius: 2px;
  box-shadow: 1px 2px 10px 0px rgba(0, 0, 0, 0.3);
  background: #29434E;
}

.center {
  position: absolute;
  height: 200px;
  width: 220px;
  top: 90px;
  left: 90px;
}

.circle-1 {
  position: absolute;
  z-index: 3;
  height: 30px;
  width: 30px;
  top: 95px;
  left: 95px;
  background: #5DDEF4;
  border-radius: 50%;
  animation-fill-mode: both;
  animation: appear-1 2s cubic-bezier(0.21, 0.98, 0.6, 0.99) infinite alternate;
}

.circle-2 {
  position: absolute;
  z-index: 2;
  width: 60px;
  height: 60px;
  top: 80px;
  left: 80px;
  background: #00ACC1;
  border-radius: 50%;
  animation-fill-mode: both;
  animation: appear-2 2s cubic-bezier(0.21, 0.98, 0.6, 0.99) infinite alternate;
}

.circle-3 {
  position: absolute;
  z-index: 1;
  height: 90px;
  width: 90px;
  top: 65px;
  left: 65px;
  background: #007C91;
  border-radius: 50%;
  animation-fill-mode: both;
  animation: appear-3 2s cubic-bezier(0.21, 0.98, 0.6, 0.99) infinite alternate;
}

@keyframes appear-1 {
  0%, 70% {
    box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
    transform: scale(0);
  }
  100% {
    box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
    transform: scale(1);
  }
}
@keyframes appear-2 {
  0%, 40% {
    box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
    transform: scale(0);
  }
  100% {
    box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
    transform: scale(1);
  }
}
@keyframes appear-3 {
  0%, 10% {
    box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
    transform: scale(0);
  }
  100% {
    box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
    transform: scale(1);
  }
}