[@zemi12 Participant 11 years, 10 months ago]

Thank you, I solved it.

#bbpress-forums div.odd,
#bbpress-forums ul.odd {
font-size:12px;
margin-top:0;
}

#bbpress-forums div.even,
#bbpress-forums ul.even {
font-size:12px;
margin-top:0;
}