* {
  margin: 0;
  padding: 0;
}

body {
  text-align: center;
  background: #000;
  font-size: 16px;
  color: #666;
}

audio {
  width: 300px;
  margin: 10px 0;
}

.container {
  height: 500px;
  overflow: hidden;
}

ul {
  transition: all 1s;
}

ul li {
  list-style: none;
  line-height: 30px;
  transition: all 0.5s;
}

ul li.active {
  color: #fff;
  transform: scale(1.2);
}