Hi Tom,
your code are all correct I just rewrite it into a valid css and html codes something like this below.
<style>
.table2 tr:nth-child(odd) { background-color:#ee33ff; }
.table2 tr:nth-child(even){ background-color:#ffffff; }
</style>
<table class="table2">
<tr>
<td> picked_by </td>
<td> sort_by "</td>
<td> items-pick </td>
<td> string(int(my-pick),"HH:MM:SS") </td>
</tr>
<tr>
<td> picked_by </td>
<td> sort_by "</td>
<td> items-pick </td>
<td> string(int(my-pick),"HH:MM:SS") </td>
</tr>
<tr>
<td> picked_by </td>
<td> sort_by "</td>
<td> items-pick </td>
<td> string(int(my-pick),"HH:MM:SS") </td>
</tr>
</table>
Regards,
Orchid