body {
 background-color: lightgreen;
}
div {
  position: relative;
  height: 200px;
  width: 200px;
}
#postIt1 {
  background-color: lightblue;
  color: yellow;
  left: 540px;
  top: 360px;
}
#postIt2 {
  background-color: blue;
  color: white;
  left: 50px;
  top: 35px;
}
#postIt3 {
  background-color: red;
  color: green;
  left: 100px;
  top: 45px;
}
#postIt4 {
  background-color: green;
  color: orange;
  left: 150px;
  top: 55px;
}