stylesheet.css

body {
  background-color: #9b59b6;
}

.loader {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.loader > div {
  width: 8px;
  height: 8px;
  background-color: #fff;

  border-radius: 100%;
  display: inline-block;
  -webkit-animation: fadeDelay 1.4s infinite ease-in-out;
  animation: fadeDelay 1.4s infinite ease-in-out;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}

.loader .circle1 {
  -webkit-animation-delay: -0.32s;
  animation-delay: -0.32s;
}

.loader .circle2 {
  -webkit-animation-delay: -0.16s;
  animation-delay: -0.16s;
}

.loader .circle3 {
  -webkit-animation-delay: -0.08s;
  animation-delay: -0.08s;
}

@-webkit-keyframes fadeDelay {
  0% { opacity: 1; }
  50% { opacity: 0; } 
  100% { opacity: 1; }
}

@keyframes fadeDelay {
  0% { opacity: 1; }
  50% { opacity: 0; } 
  100% { opacity: 1; }
}