Appearance
How the page is darkened
Read the theme is the one to use. Every stylesheet on the page is read and re-coloured, which is why it works on a theme nobody has ever seen: photographs stay photographs, a coloured button stays that colour but darker, and text stays legible against whatever is behind it. It is about 38KB over the wire, fetched only once a reader chooses dark.
Invert the page is one CSS filter over everything. It costs nothing and runs anywhere, and it inverts pictures — corrected for anything in an <img>, and impossible to correct for a picture set as a CSS background. Suits a text site; on anything with a photographic header it will look wrong.
A plain stylesheet writes your four colours into the page and stops. No JavaScript at all after load, and no cleverness: it sets the page, the type, the links and the form controls, and leaves anything it cannot know about alone. The fastest of the three and the least faithful on a complicated theme.
The palette
Six to start from — Ink, Slate, True black, Warm, Midnight, Forest. Every one was checked for contrast before it shipped, so choosing one and changing nothing gives you a page people can read.
Under them are the four colours themselves. They start as the palette you picked; change any and the change is yours to keep, until you pick a different palette, which brings its own four. The preview beside them shows the numbers: 4.5:1 is the line for body text, and the preview says so rather than leaving you to guess.
Fine tuning
Brightness, contrast, warmth and colour drain. A hundred means "no change". The defaults are already a touch softer than a straight inversion, which is what stops a dark page glaring. Leave them alone unless something looks wrong.
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