Exercise:

Add a zebra-stripes to the table.

<table class="table 
w3exercise_input_no_0
">
  <tr>
    <td>John</td>
    <td>Doe</td>
    <td>john@example.com</td>
  <tr>
  <tr>
    <td>Mary</td>
    <td>Moe</td>
    <td>mary@example.com</td>
  </tr>
  <tr>
    <td>July</td>
    <td>Dooley</td>
    <td>july@example.com</td>
  </tr>
</table>