Add a line break and create a textarea element.

<html>
<head><style>body {min-height: 300px;} input { font-size: 16px; } textarea { font-size: 16px; } </style></head>
<body>
 <h3>Student Feedback</h3>
 <input type="text" placeholder="Name">
 <br>
 <textarea type="text" placeholder="Your feedback"></textarea>
</body>
</html>]]>

Make sure to assemble <br>, <textarea type="text" placeholder="Your feedback">, and </textarea>.