Very simple dark mode for webassembly rendered canvas
/* ==UserStyle==
@name Dark mode for Simon Tatham's Portable Puzzle Collection
@version 1.0.1
@description Very simple dark mode for webassembly rendered canvas
@author Calcifer
@license MIT
@namespace https://github.com/Calciferz
==/UserStyle== */
@-moz-document domain("chiark.greenend.org.uk") {
html {
background: #ddd;
filter: invert(1) hue-rotate(230deg) contrast(1.2);
}
}