body{
  margin:0;
  background:#ccc;
  font-size:0;
}

.wrapper{
  background:white;
  width:1024px;
  margin:0 auto;
}

#iframe-head, #iframe-foot, #iframe-bottom{
  border:none;
  margin: auto;
  display: block;
}

.bottom-wrapper{
  height;100px;
  background:white;
}

.btn-choice{
  display:flex;
}

.btn-rev{
  padding:8px 15px;
  margin:10px 0 10px 430px;
  background:#007700;
  color:white;
  opacity:0.8;
  border-radius:4px;
}

.other-course{
  padding:8px 15px;
  margin:10px 0 10px 30px;
  background:#000055;
  color:white;
  opacity:0.8;
  border-radius:4px;
}

.btn-choice a{
  font-size:30px;
  color:white;
  text-decoration:none;
}

.btn:hover{
  opacity:1;
}