You need buttons that match, that blue and the black don't go together very well.
Plus starting at your style's colors for only a few seconds caused my eyes to hurt. The black background just clashes with the light from the grey table, and it just causes eyes to hurt. And probably the main thing that clases is the white links with the black background. It's not a very easy style to look at.
But who am I to complain, your site seems very successful, so you're doing it right it seems.