Display the input element with placeholder="City" below the other input element by using the <br> tag.

<html>
<head><style>body {min-height: 300px;} input { font-size: 16px; } textarea { font-size: 16px; } </style></head>
<body>
  <h3>Billing Address</h3>
  <input type="text" placeholder="Street">
  <br>
  <input type="text" placeholder="City">
</body>
</html>]]>

Make sure to place <br> first and then <input type="text" placeholder="City">.