display.css

.box100 {
  width: 100px;
  height: 100px;
  top: 5px; 
  left: 5px;
}

.box200 {
  width: 200px;
  height: 200px; 
}

.box50 {
  width: 50px;
  height: 50px;
  top: 15px; 
  left: 15px;
}