CodePen Embed - Top to Bottom Flow of block Element

<html>
  <head>
    <meta charset="utf-8">
    <title>Block example 1</title>
  </head>
  <body>
    <div id="container">
      <div></div><div></div><div></div>
    </div>
  </body>
</html>

body {
  font-family: Helvetica, sans-serif;
}

#container div {
  background-color: lavenderblush;
  border: 2px solid black;
  height: 50px;
  width: 50px;
}

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