Learn More About CSS Pseudo Selectors By Building A Balance Sheet - Step 11 What am I doing wrong here?

Tell us what’s happening:
Describe your iStep 11 asks for me to nest a span element within the th element. Give the first two span elements a class of sr-only and the last span element a class of current. Ive done what it asks but it won’t pass my code. Hoping someone else can see my issue better than me because I cant. Thanks for any help! Much appreciated!e in detail here.

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Balance Sheet</title>
  <link rel="stylesheet" href="./styles.css">
</head>
<body>
  <main>
    <section>
      <h1>
        <span class="flex">
          <span>AcmeWidgetCorp</span>
          <span>Balance Sheet</span>
        </span>
      </h1>
      <div id="years" aria-hidden="true">
        <span class="year">2019</span>
        <span class="year">2020</span>
        <span class="year">2021</span>
      </div>
      <div class="table-wrap">
        <table>
          <caption>Assets</caption>
          <thead>
            <tr>
              <td></td>
              <th> <span class="sr-only year">2019</span></th>
              <th> <span class="sr-only year">2020</span></th>
              <th> <span class="current">2021</span></th>
              
            </tr>
          </thead>
          <tbody>
          </tbody>
        </table>
        <table>
        </table>
        <table>
        </table>
      </div>
    </section>
  </main>
</body>
</html>
/* file: styles.css */

  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15

Challenge: Learn More About CSS Pseudo Selectors By Building A Balance Sheet - Step 11

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Take a look at the task once more:
which classes are required for span elements?
which - for th elments?