I found something weird. I made an iFrame inside a Div. That Div is set to overflow:auto. So the iFrame inside it can be scrolled up and down. But it also moves a little bit from left to right! This is not the case when I change the iFrame to a normal Div. Is this a known issue? Is there a way to solve it?
Got it! I placed a tiny div
Got it! I placed a tiny div below the iFrame and now it scrolls only straight up & down.