<div class="pulsating-circle"></div>

body {
  background: #454a59;
}

.pulsating-circle {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  width: 30px;
  height: 30px;
}
.pulsating-circle:before {
  content: "";
  position: relative;
  display: block;
  width: 300%;
  height: 300%;
  box-sizing: border-box;
  margin-left: -100%;
  margin-top: -100%;
  border-radius: 45px;
  background-color: #01a4e9;
  -webkit-animation: pulse-ring 1.25s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
          animation: pulse-ring 1.25s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}
.pulsating-circle:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  width: 100%;
  height: 100%;
  background-color: white;
  border-radius: 15px;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
  -webkit-animation: pulse-dot 1.25s cubic-bezier(0.455, 0.03, 0.515, 0.955) -0.4s infinite;
          animation: pulse-dot 1.25s cubic-bezier(0.455, 0.03, 0.515, 0.955) -0.4s infinite;
}

@-webkit-keyframes pulse-ring {
  0% {
    transform: scale(0.33);
  }
  80%, 100% {
    opacity: 0;
  }
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.33);
  }
  80%, 100% {
    opacity: 0;
  }
}
@-webkit-keyframes pulse-dot {
  0% {
    transform: scale(0.8);
  }
  50% {
    transform: scale(1);
  }
  100% {
    transform: scale(0.8);
  }
}
@keyframes pulse-dot {
  0% {
    transform: scale(0.8);
  }
  50% {
    transform: scale(1);
  }
  100% {
    transform: scale(0.8);
  }
}