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<style>
  div {
    position: absolute;
    left: 0;
    top: 0;
  }
  #red {
    width: 300px;
    height: 300px;
    background-color: red;
  }
  #lightgreen {
    width: 300px;
    height: 100px;
    background-color: lightgreen;
  }
  #green {
    left: 100px;
    top: 100px;
    width: 200px;
    height: 100px;
    background-color: green;
  }
  #darkgreen {
    left: 200px;
    top: 200px;
    width: 100px;
    height: 100px;
    background-color: darkgreen;
  }
</style>
<div id="red"></div>
<div id="lightgreen"></div>
<div id="green"></div>
<div id="darkgreen"></div>