Cannot type in input text field

Question

The input field is not letting me type. I can type in the input box once I delete the first div with the id="viewport" attribute. How am I going to fix this?

<div id="viewport"></div>
<div class="form">
  <h2 id="h2">Need a project from<br>Google Cloud Storage?</h2>
  <form id="fileDownloadForm" method="GET" action="downloadBlob2" enctype="multipart/form-data">
    <input type="text" id="textBox" name="objectToSearch" placeholder="Type the name of the project here." />
    <button id="downloadBtn" type="submit" class="btn btn_primary">Download</button>
  </form>
</div>