I'm not a CSS expert, but doing a search for "float image to bottom right" I find that there's no good way to do it. There's mention of doing it via javascript or by using a table, but I don't know how either of those would work (I guess there's no reason you couldn't use a table, if you can figure that one out. Here's one of the links I found that talks about the issue:
http://stackoverflow.com/questions/4...ttom-right-div).
As for the padding, your CSS has left padding for quote_left and right padding for quote_right, and that seems to be what's there.