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If you look at the source-code file, you will find it is written in HTML, the language-code of the web. You can however proceed even if you are not familiar with HTML, as long as you only change the entries described below. On your saved file you will see the specifications of two tables. The contents of each cell of the table are preceded by the letters TD (Table Data), and each of the three rows is preceded by TR (Table Row). The entry which specifies the color of a given cell in the table is of the form
BGCOLOR = #D0FBFF
The particular specification above is taken from the bottom cell, whose color matches the background colors of "From Stargazers to Starships." It is actually a combination of three numbers:
D0 FB FF
What? They do not look like three numbers? That is because they are written in base 16, a close cousin to the binary system (base 2) in which computer hardware is programmed. In that system, instead of counting
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
we count
0 1 2 3 4 5 6 7 8 9 A B C D E F 10
The letters A to F are now numerals. In base 10, 100 = 10x10. The number written 100 in base 16 would in base 10 be written 16x16 =256, and the number preceding it is FF=255. D0FBFF gives the intensity of the three colors which make up the background: D0 is the intensity of red, FB is the intensity of green and the second FF is the intensity of blue, the maximum blue you can get. If you wanted to specify pure red, green or blue, you would choose FF000, 00FF00 or 0000FF, and these choices are in fact used in the first table. Also, 000000 is black--no color at all, and FFFFFF is white, the sum of all three colors at saturation intensity. In between you can have 777777 or AAAAAA or CCCCCC giving you various shades of gray.
If you want to experiment with colors, let your browser read the copy of this file from your computer. The menu-commands depend on the browser, e.g. ("Open ... page source... Save"). Leave the colors of the first table for reference, but change those of the second table using your word processor (always save as TEXT!), then command "reload" and see what you have accomplished. You can also change the color of the lettering, by modifying the color specification that follows the word "FONT"--but don't be surprised to see bizarre results!
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