How do I set the background to this?

I installed some extra profile options and one of the options I'm using isn't going along the theme so I'm trying to customize it, but not sure how. This is my attempt for it. tr.field_2 field_date-of-birth alt field_type_birthdate { background-color: #000000 !important; } here is the source code around it if it helps.

			<div class="bp-widget base">

				<h4>Base</h4>

				<table class="profile-fields">

					
						
							<tr class="field_1 field_user-name field_type_textbox">

								<td class="label">User Name</td>

								<td class="data"><p><a href="http://equestria-social.tk/members/?s=Yggdrasil" rel="nofollow">Yggdrasil</a></p>
</td>

							</tr>

						
						
					
						
							<tr class="field_2 field_date-of-birth alt field_type_birthdate">

								<td class="label">Date of Birth</td>

								<td class="data">28</td>

							</tr>

						
						
					
						
							<tr class="field_5 field_gender field_type_selectbox">

								<td class="label">Gender</td>

								<td class="data"><p><a href="http://equestria-social.tk/members/?s=Male" rel="nofollow">Male</a></p>
</td>

							</tr>

						
						
					
				</table>
			</div>