seven styles messed up during install

While this patch works (for this form, I haven't checked others), I think this has more to do with the markup free clearing which is applied to all form items.
From reset.css:

/**
 * Markup free clearing ===============================================
 *
 * Consider adding your own selectors to this instead of finding ways
 * to sneak the clearfix class into Drupal's markup.
 * From http://www.positioniseverything.net/easyclearing.html
 */
div.form-item:after,
ul.links:after,
div.admin-panel .body:after,
.clearfix:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

As the sidebar is floated right, this CSS stretches the div to clear the height of the sidebar.
If you continue the installation, the form items on the next page are wrapped in fieldsets, so we don't see this issue.

Solutions could include:

• removing div.form-item:after from the above CSS
• floating the entire form/content div left
• wrapping the form items in a fieldset

Just off to look at other forms in seven to judge what's going to be affected by any of these changes (I may be some time...)

Hmm. Seven doesn't really have a sidebar, apart from the maintenance page.

Still, perhaps it's safest to just override this style for the maintenance pages:

body.in-maintenance div.form-item:after {
  content: "";
  display: none;
  clear: none;
}

Doesn't appear to break anything else.

Weird. I swear I committed a fix for this problem already. We are probably going to need someone CSS-savvy to go in and take stock of Seven's CSS and do one big clean-up sweep before we turn it into a spiralling horror of nightmares and tears.

bleen18, mcjim, are you game? :)

Anyway, committed to HEAD. Thanks!