Here is a pic assuming I figured out which code puts it in...
Note the bottom edge of the info bar...more black below it on the right than on the left.
If it were a very bottom scroll bar, the bottom of the letters on the left would be slightly cut off, while there would be some black space below the letters on the right.
If a horizontal line appears at the top of the image, it does not look slanted. Looking at pure images (no text or bars) you do not notice anything wrong; if it is there, you don't see it.
Let me describe it this way: imagine the image, perfect, on stretchy rubber--perfectly rectangular, every edge perfectly vertical or horizontal.
Now tack down both upper corners and the lower right corner.
Then pull straight down on the lower left corner so that the bottom edge slants down-left from the lower right corner which was tacked in place.. the picture is the result. Although it may only be the "overlays" that slant, not the underlying image.