well you can use any class of those that are already in mybb such as trow1, trow2.
anyway you css has a problem, it should be .legend
regards.
<legend> is a html tag, thus it doesn't need the preceding dot.
lol never thought that he was intending to use it this way
i thought a normal class but called legend
no legend is an actual xhtml tag...it's not defined currently in mybb and it should be...it's used for the attachments box