Missing some CSS IDs on content types

This is probably something I've done wrong. But some for some reason not all of the sections are being assigned ID values, therefore they cannot be targeted with the CSS.

Example:

#user-profile #profile-stats {
	border:#666 1px solid;
	margin-top:15px;
	padding:5px;
}

This works fine because the stats section has the id #profile-stats assigned to it.

#user-profile #profile-about {
	border:#666 1px solid;
	margin-top:15px;
	padding:5px;	
}

This doesn't work because for whatever reason the about section has no id assigned to it.

Is there a way for me to alter this? Thanks!