ami.js/lessons/08/demo.css

<p align="center"> <img src="https://cloud.githubusercontent.com/assets/214063/23213764/78ade038-f90c-11e6-8208-4fcade5f3832.png" width="60%"> </p>

body{
  font-family: source-code-pro, sans-serif;
  color:#F9F9F9;
  background-color: #212121
}

#container {
  background-color: #000;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  position: absolute;
  width: 100%;
  height: 100%;
  overflow:hidden;
}

.container.progress {
  font-size: 2.4em;
  text-align: center;
  width: 200px;
  height: 8px;
  position: absolute;
  background-color: rgba(158, 158, 158, 0.5);
  z-index: 1;
  border: 1px solid;
  box-sizing: border-box;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.progress.load{

  box-sizing: border-box;
  border: 3px solid;
  width: 0%;
  transform: translateZ(0); 

}

.progress.parse{

  display: none;
  transform: translateZ(0); 

}

.beat {

  color: #E91E63;
  -webkit-animation: love .5s infinite linear alternate-reverse;
  -moz-animation: love .5s infinite linear alternate-reverse;
  animation: love .5s infinite linear alternate-reverse;

}

@keyframes love {

  animation-name: love;
  animation-duration: 0.5s;
  animation-timing-function: linear;
  animation-delay: initial;
  animation-iteration-count: infinite;
  animation-direction: alternate-reverse;
  animation-fill-mode: initial;
  animation-play-state: initial;
  0% {
    transform: scale(1.3);
    }
  100% {
    transform: scale(1.7);
  }

}