Is there a way to increase the size of the scroll bar on the right side of the browser?

I don't know why any browser never seems to allow for this. I hate using the mouse wheel to scroll down webpages and always use the scroll bar on the right side. Problem is most of the time it's way to skinny/narrow to be practically used and the bar you use to scroll it up and down - especially on long pages - is so tiny as to be completely unusable. It may not be an issue for tweens who still have eyes like hawks but for older people, like me, it's a pain in the tuchus. I'd like to be able to increase both the size - width mostly - of the slide rail and increase the overall size of the slide bar you use to control it.

Thanks!