<div id='preloader'>
<div class='loader spinner'>
  <div class='dot'></div>
  <div class='dot'></div>
  <div class='dot'></div>
</div>
</div>

#preloader{overflow:hidden;background:#fff;left:0;right:0;top:0;bottom:0;position:fixed;z-index:9999}
.loader{position:absolute;top:50%;left:50%;width:200px;height:200px;margin-top:-100px;margin-left:-100px}
.loader > .dot{position:absolute;top:50%;left:50%;z-index:10;width:160px;height:100px;margin-top:-50px;margin-left:-80px;border-radius:5px;background-color:#1e3f57;transform-type:preserve-3d;animation:dot1 3s cubic-bezier(.55,.3,.24,.99) infinite}
.loader > .dot:nth-child(2){z-index:11;width:150px;height:90px;margin-top:-45px;margin-left:-75px;border-radius:3px;background-color:#3c617d;animation-name:dot2}
.loader > .dot:nth-child(3){z-index:12;width:40px;height:20px;margin-top:50px;margin-left:-20px;border-radius:0 0 5px 5px;background-color:#6bb2cd;animation-name:dot3}
@keyframes dot1{3%,97%{width:160px;height:100px;margin-top:-50px;margin-left:-80px}30%,36%{width:80px;height:120px;margin-top:-60px;margin-left:-40px}63%,69%{width:40px;height:80px;margin-top:-40px;margin-left:-20px}}
@keyframes dot2{3%,97%{width:150px;height:90px;margin-top:-45px;margin-left:-75px}30%,36%{width:70px;height:96px;margin-top:-48px;margin-left:-35px}63%,69%{width:32px;height:60px;margin-top:-30px;margin-left:-16px}}
@keyframes dot3{3%,97%{width:40px;height:20px;margin-top:50px;margin-left:-20px}30%,36%{width:8px;height:8px;margin-top:49px;margin-left:-5px;border-radius:8px}63%,69%{width:16px;height:4px;margin-top:-37px;margin-left:-8px;border-radius:10px}}