css: CSS Loader

css_loader.css

.loader {
  text-align: center;    
}
.loader span {
  display: inline-block;
  vertical-align: middle;
  width: 10px;
  height: 10px;
  margin: 50px auto;
  background: black;
  border-radius: 50px;
  -webkit-animation: loader 0.9s infinite alternate;
  -moz-animation: loader 0.9s infinite alternate;
}
.loader span:nth-of-type(2) {
  -webkit-animation-delay: 0.3s;
  -moz-animation-delay: 0.3s;
}
.loader span:nth-of-type(3) {
  -webkit-animation-delay: 0.6s;
  -moz-animation-delay: 0.6s;
}
@-webkit-keyframes loader {
  0% {
    width: 10px;
    height: 10px;
    opacity: 0.9;
  }
  100% {
    width: 10px;
    height: 10px;
    opacity: 0.1;
  }
}
@-moz-keyframes loader {
  0% {
    width: 10px;
    height: 10px;
    opacity: 0.9;
  }
  100% {
    width: 10px;
    height: 10px;
    opacity: 0.1;
  }
}​

css_loader.html

<div class="loader">
	<span></span>
	<span></span>
	<span></span>
</div>​