SOURCE

<h1 class="load">
  <span>U</span>
  <span>e</span>
  <span>e</span>
  <span>р</span>
  <span>u</span>
  <span>ж</span>
  <span>b</span>
    <span>е</span>
  <span>м</span>
</h1>

body{
  background: #CCD0D4;
}
h1.load{
  text-align: center;

  font-family: 微软雅黑;
  font-size: 4.6875em;
  color: transparent;
  letter-spacing: 0.01em;
}
.load span{
  text-shadow:
    0 0 2px rgba(204, 208, 212,0.9),
    0 15px 25px rgba(0, 0, 0, 0.3),
    0 -2px 3px rgba(0, 0, 0, 0.1),
    0 -5px 10px rgba(255, 255, 255, 0.5),
    0 5px 10px rgba(0, 0, 0, 0.3),
    0 3px 4px rgba(255, 255, 255, 0.2),
    0 0 20px rgba(255, 255, 255, 0.45);
  
    animation: loading 1.20s ease-in-out infinite alternate;
}

@keyframes loading {
	to {text-shadow:
    0 0 2px rgba(204, 208, 212,0.2),
    0 0 3px rgba(0, 0, 0, 0.02),
    0 0 0 rgba(0, 0, 0, 0),
    0 0 0 rgba(255, 255, 255, 0),
    0 0 0 rgba(0, 0, 0, 0),
    0 0 0 rgba(255, 255, 255, 0),
    0 0 0 rgba(255, 255, 255, 0);}
}

.load span:nth-child(2){
  animation-delay:0.15s;
}
.load span:nth-child(3){
  animation-delay:0.30s;
}
.load span:nth-child(4){
  animation-delay:0.45s;
}
.load span:nth-child(5){
  animation-delay:0.60s;
}
.load span:nth-child(6){
  animation-delay:0.75s;
}
.load span:nth-child(7){
  animation-delay:0.90s;
}
.load span:nth-child(8){
  animation-delay:1.05s;
}
.load span:nth-child(9){
  animation-delay:1.20s;
}