CodePen Embed - CSS Riddle

<div class="container"><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div></div>

.container {
  width:210px; 
}

.container div {
  width:100px;
  height:20px;
  background:lightblue;
  display:inline-block;
  border: 1px solid blue;
  vertical-align:top;
}

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