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<!DOCTYPE html>
<style>
  .containing-block {
    position: relative;
    width: 150px;
    height: 150px;
    outline: 2px black solid;
  }
  .cell {
    width: 50px;
    height: 50px;
  }
  #anchor-cell {
    position: absolute;
    top: 50px;
    left: 50px;
    background: green;
  }
  .anchor-positioned-cell {
    position: absolute;
  }
  #target-1 {
    top: 0;
    right: 0;
  }
  #target-2 {
    bottom: 0;
    left: 0;
  }
  #target-3 {
    bottom: 0;
    right: 0;
  }
  .blue-background {
    background: blue;
  }
  .magenta-background {
    background: magenta;
  }
  .cyan-background {
    background: cyan;
  }
</style>
<body>
  <div class="containing-block">
    <div class="cell" id="anchor-cell"></div>
    <div class="cell anchor-positioned-cell" id="target-1">
      <div class="cell blue-background"></div>
    </div>
    <div class="cell anchor-positioned-cell" id="target-2">
      <div class="cell magenta-background"></div>
    </div>
    <div class="cell anchor-positioned-cell" id="target-3">
      <div class="cell cyan-background"></div>
    </div>
  </div>
</body>