You have JavaScript disabled. Without JavaScript, you cannot customise the theme. Luckily, that is the only thing that you cannot do without JavaScript! If you can live with light mode, you may continue running this site without JavaScript and be perfectly fine. If you want dark mode, please enable JavaScript.
Note that the JavaScript is Free Software under the GPLv3, so you should have no concerns for it being nonfree. :-)

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This page is where you can configure the theme for this website.

Do NOT click the button below if you have epilepsy or are otherwise sensitive to flashing lights.