body{
  height: 3000px;
}

.demoWrap{
  position: fixed;
  left: 100px;
  top: 100px;
}

.demoWrap .demo {
  float: left;
  text-align: center;
  font-size: 16px;
  margin-left: 100px;
}

.turntableDemo1, .turntableDemo2 {
  width: 475px;
  height: 260px;
  overflow: hidden;
  border: 1px #d0d0d0 solid;
  margin-bottom: 20px;
}