<div id="container">
  <div class="red">Red</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
</div>
#container {
  width: 290px;
  height: 270px;  
  margin: 50px auto 0;
  position: relative;
  text-align: center;
  line-height: 160px;
  color: #fff;
  font-weight: bold;
  background-color: #ffe4e1;
  
  .red {
    background-color: rgba(255, 0, 0, 0.5);
    width: 160px;
    height: 160px;
    position: absolute;
    top: 5px;
    left: calc(50% - 80px);
    border-radius: 80px;
  }
  
  .green {
    background-color: rgba(0, 255, 0, 0.5);
    width: 160px;
    height: 160px;   
    position: absolute;
    bottom: 5px;
    right: 5px;
    border-radius: 80px;
  }
  
  .blue {
    background-color: rgba(0, 0, 255, 0.5);
    width: 160px;
    height: 160px;
    position: absolute;
    bottom: 5px;
    left: 5px;
    border-radius: 80px;
  }
}

External CSS

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External JavaScript

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