You can change the custom css. Open the reader, go to Settings, and on the User Stylesheet tab put in something like:
body { color: #ffffff; background-color: #000000;}
That will give you white on black. Adjust the "color" style for the shade of yellow you prefer. #ffff00 is bright yellow, but you'll probably want something different. If you don't know the hex code of the yellow you like, try matching it in a paint program like Paint.NET. If your program doesn't automatically generate the hex value for you, you convert it easily enough if you have the RGB 0-255 values. Just convert to decimal (Windows' built-in calculator in Programmer mode can do this) and put then in as #RRGGBB. For example, the blue message headers here on mobileread are #6384B0, or 99 Red, 132 Green, and 176 Blue.
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