loading.css

/*
 * Copyright (c) Robert Lemon <http://codepen.io/rlemon/>
 * Under MIT License. More details: http://blog.codepen.io/legal/licensing/
 * Loading Animation - more Details: http://codepen.io/rlemon/pen/KyDgh
 */
.drops {
  list-style: none;
  position: relative;
  height: 10px;
  width: 140px;
  margin: 0 auto; /* center the animation */
}
.drops li {
  position: absolute;
  top: 0px;
  height: 10px;
  width: 10px;
  background-color: black;
  border-radius: 5px;
  margin-left: -3000px; /* the dots like to jump out of place without this */
  animation-name: loading;
  animation-duration: 5s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: normal;
}
.drops li:nth-child(1) {
  left: 0px;
  animation-delay: 250ms;
}
.drops li:nth-child(2) {
  left: 40px;
  animation-delay: 500ms;
}
.drops li:nth-child(3) {
  left: 80px;
  animation-delay: 750ms;
}
.drops li:nth-child(4) {
  left: 120px;
  animation-delay: 1s;
}
.drops li:nth-child(5) {
  left: 160px;
  animation-delay: 1.25s;
}
@keyframes loading {
  0% { margin-left: -3000px; }
  30%,70% { margin-left: 0px; }
  100% { margin-left: 3000px; }
}
/* Colours */
.drops li {
  background-color: #99deff;
  box-shadow:  0 0 5px #99afff, 
               0 0 10px #99afff, 
               0 0 15px #99afff, 
               0 0 20px #99afff, 
               0 0 30px #99afff, 
               0 0 40px #99afff;
}