I have a problem with space line?

I have a problem with a code in html/css about space line:

this is the code:

<tr>
<td> <label class='checkbox'><input type="checkbox" class="CustomCheckbox" name="c11"><strong>Negativ pentru o leziune intraepiteliala sau maligna</strong></label></td>
</tr>
<tr>
<td> <label class='checkbox'><input type="checkbox" class="CustomCheckbox" name="c12">Anomalii ale celulelor epiteliale - vezi diagnostic descriptiv</label></td>
</tr>
<tr>
<td> <label class='checkbox'><input type="checkbox" class="CustomCheckbox" name="c13">Altele - vezi diagnostic descriptiv</label></td>
</tr>

Show like this: https://s31.postimg.org/6haje30i3/Untitled21321.png How can I make the rows to be closer to one another ?