Scroll Bars

May be a daft question be does anyone know how to change the button colour on the scroll bar as I seem to waste an awful amount of time to find it. lol   At the moment it is a greyish white on the same colour background.  Today I have looked in options and colours etc and tried various things but nothing changes this.  I want the button to be a different colour to the background . is that possible and if so how?????
 
Many thanks

Thanks but won´t solve the problem.  Actually the button appears to be very pale blue on a white background and the colour of the button only intensifies once your mouse arrow is on it, but it´s the locating it in the first place that is the problem.  All of the Sonar Producers 2/7/8.5 that I´ve used have been this way and I wonder why it hasn´t been sorted out. Surely I can´t be the only one that finds this a nuisance!!!
 
Also I keep losing the bottom scroll bar in console view. What am I doing wrong and how do I get it back?
 
Thanks for your time.