when displaying an unpublished page, the theme shows a pinkish white background.

Hi, thanks for pointing this out. I haven't noticed this before.
The pinkish color comes from drupals node-module. node.css defines a background-color of #FFF4F4 for unpublished nodes.

If you add
.node-unpublished {
background-color: transparent;
}
to your styles.css it will override the drupal node.css

I am attaching an amended css for the drupal 7 theme and will include this in the next release. Thanks for the info.