The scrollbars in Unity are of very low contrast, and I can't notice where the scroll bar bug is just with peripheral vision. I have to look at the scrollbar. With a very 22" monitor, 1920*1080, the bar is quite small, and it's hard to notice where the bug is.
Look at Mac OS X interface and notice the blue, contrast scroll bar bug. You don't need to look at it directly to have the idea where you are in the page.
Every person's peripheral vision is of low-res. I don't have a screenshot, but you can imagine what you see by doing a simple trick:
take a screenshot and blur it by 15px in GIMP. This is how you see everything with peripheral vision. The scrollbar bug becomes completely invisible.
How can I change it so that it is contrast and I see where I am every time?