Darken background & enlarge fonts.

Hello all, I'm looking for some help or suggestions of how to find out.

For quite sometime now, I've been looking for a way to customize the colors and font size, of the backgrounds within programs. For example, the web browser, is white, which really hurts my eyes. I understand I can increase the fonts and that is fine. I use the AVS products for converting VHS to DVD and I would like to change it's white background and small fonts. To be able to do this would make things nicer, as it stands now, it;s the cause of many headaches. Hopefully my attachment will make it more clear if I didn't explain well.

Thanks for the help :)

Right clik on the desktop, select personalization. Scroll down and choose the High Contrast Black theme, then clik on color and customize to your choice.

That is pretty good, ty. However, it doesn't work with the apps I use most.

ty though :)