The default look off the scroll bar is fairly poor

The default look of the scroll bar is fairly poor. I have searched for a way to style it but I must admit as yet I have not looked at the CSS. Is that the way to go or is there properties that I am missing. Such as colour, raised et cetera? If so is there an example of their use

I have tried that it does not appear to do anything! I tried by radically changing the colour. I change the one that was white to blue that is 0,0,255 instead of 255,255,255 which had no observable change!