[nerbert]

You can change the background color in Stylevars > bbcode > vbbcode_background_color. If you want to change the border you must edit the <pre> tag. to put in additional inline styling go all the way to the end and find the ";"

</vb:if>;"</vb:if>>{vb:raw code}</pre>

You can put additional styling between the ";" and the quote mark that follows. Alternatively you could edit whatever css template contains the bbcode_code class