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Dark mode for Simon Tatham's Portable Puzzle Collection

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);
  }
}