These pages may look better with some browsers than others, but they are not geared toward any particular one. If you are using a text browser or if you are not loading images, you will not see the illustrative diagrams and screen shots. However, ALT texts are provided to cue you in on images you may want to load.
I have decided not to change the background color since the screen may look horrible if the color is dithered. Though a safe and popular choice, I will not use a white background, either (too harsh; hate it, hate it). If you don't like the default grey background of your browser, by all means, please change it yourself :-)