#box1, #box2 {
  width: 200px;
  height: 100px;
  margin: 10px auto;
  text-align: center;
  line-height: 100px;
  color: white;
}

#box1 {
  background-color: #3498db;
  display: none;
}

#box2 {
  background-color: #e74c3c;
  display: none;
}

#progress-container {
  width: 200px;
  height: 30px;
  margin: 20px auto;
}
#box3 {
  width: 100px;
  height: 100px;
  margin: 10px auto;
  background-color: #9b59b6;
  color: white;
  text-align: center;
  line-height: 100px;
  transition: transform 0.5s;
}