If you want to target all the <tr>
or <td>
children inside the table use:
table#leaderboard tr
{
/*whitespace combinator*/
/*all children*/
}
If you want to target only the direct children (in case you have nested tables) use:
table#leaderboard > tr
{
/*right arrow combinator*/
/*direct children only*/
}
Edit
Outside the
table#leaderboard {
some css
some css
}
that is. You can't nest CSS.
<table>
<tr>
<td>Direct td child of tr</td>
</tr>
<tr>
<table>
<tr>
<td>Indirect td child of the outer tr</td>
</tr>
</table>
</tr>
</table>