body {
  background: url('http://www.bj.xinhuanet.com/wlgdn2020/images/bg.jpg') top center no-repeat;
}

.main-container {
  width: 1100px;
}

#video:after {
  content:url(http://www.bj.xinhuanet.com/wlgdn2020/images/video2.png);
  position:absolute;
  left:10px;
  bottom:50px;
  opacity: 0.5;
}