Semi-transparent style?

[josephu]

ok, Im back at it, the background of my artcles is transparent allowing the bodys background image to shine through, I like this effect, I just want to make it a little less transparent to offer a little more distinction between article and background. also Id like to adjust this transparency in a few more areas as well, I know you told me what code to use, but where do I put it? In stylevars under the area I wish to make semi-transparent? (i.e. navbar background)