After uploading a custom *.css file with only some color values changed, I've noticed that the contents of some pages moved to the left, leaving virtually no space between the text and the browser window (see the second screen-shot below). These pages are in particular the pop-up windows showing "Journal Help", the various "Reading Tools" and the frame-split page showing the abstract/HTML galley + RT.
Here's a screen-shot of the layout with the original common.css:
... and here's the same with the modified one (it is interesting, that the window can't be resized, al least in Firefox):
I'd appreciate any hints on how to fix the appearance of the mentioned OJS components to match the original ones.