CodePen Embed - Height and width of block level element

<html>
  <head>
    <meta charset="utf-8">
    <title>Block example: Blocks without content</title>
  </head>
  <body>
    <div id="container">
      <p></p>
      <p></p>
      <p></p>
    </div>
  </body>
</html>

body {
  font-family: Helvetica, sans-serif;
  line-height: 24px;
}
 
/* p is block element, so height and width in CSS are respected. */
p {
  background-color: royalblue;
  height: 100px;
  width: 100px;
  margin: 10px;
}

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