<div id="pageloader">

	<div class="spinner">
	  <div class="bounce1"></div>
	  <div class="bounce2"></div>
	  <div class="bounce3"></div>
	</div>

</div>

<p>Regular page contents underneath transition DIV- hidden by default.</p>
#pageloader{
	position: fixed;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-pack: center;
	-ms-flex-pack: center;
	justify-content: center; /* center children content horizontally */
	-webkit-box-align: center;
	-ms-flex-align: center;
	align-items: center; /* center children content vertically */
	z-index: 10000;
	background: white;
}
	

.spinner {
  width: 70px;
  text-align: center;
	opacity: 1;
	transition: opacity .4s;
}

.spinner > div {
  width: 18px;
  height: 18px;
  background-color: #333;
  border-radius: 100%;
  display: inline-block;
  -webkit-animation: sk-bouncedelay 1.4s infinite ease-in-out both;
  animation: sk-bouncedelay 1.4s infinite ease-in-out both;
}

.spinner .bounce1 {
  -webkit-animation-delay: -0.32s;
  animation-delay: -0.32s;
}

.spinner .bounce2 {
  -webkit-animation-delay: -0.16s;
  animation-delay: -0.16s;
}

@-webkit-keyframes sk-bouncedelay {
  0%, 80%, 100% { -webkit-transform: scale(0) }
  40% { -webkit-transform: scale(1.0) }
}

@keyframes sk-bouncedelay {
  0%, 80%, 100% { 
    -webkit-transform: scale(0);
    transform: scale(0);
  } 40% { 
    -webkit-transform: scale(1.0);
    transform: scale(1.0);
  }
}
Rerun