#buttons {
  text-align: center;
}

#square {
  position: absolute;
  top: 150px;
  left: 100px;
  width: 200px;
  height: 200px;
  border: 2px solid black;
  padding: 10px;
  background-color: #e0e0e0;
}

div {
  padding: 10px;
}