body {
  margin: 0;
}

#box1 {
  border: 1px solid;
  height: 300px;
  width: 300px;
  background-color: skyblue;

  /* position: relative;
  top: 150px;
  left: 150px; */
  position: relative;
}

#box2 {
  border: 1px solid;
  height: 100px;
  width: 100px;
  background-color: tomato;

  position: absolute;
  top: 100px;
  left: 100px;
}