CSS margins/padding overlaps other site elements

I noticed today when using Feeds on my site that there is some CSS used for laying out the Feeds edit form that overlays other parts of the site.

Basically, there are some margins and padding applied to div.configuration that, because of their position in the HTML, sit over the top of other elements, such as the sidebar, and prevent you from clicking on links in that sidebar.
I realise this depend heavily on the theme you're using, but I imagine it'd affect quite a few themes...

Here's the CSS in question from lines 21-34 of feeds_ui.css:

div.left-bar {
  float: left;
  position: relative;
  width: 240px;
  border-right: 1px solid #DDD;
  padding: 10px 10px 0 0;
}
div.configuration {
  padding: 10px 0 0 250px;
  margin-left: -240px;
}
div.configuration-squeeze {
  margin-left: 250px;
}

If I find time later, I'll test it on Garland and try to submit a patch.