Personally, I have two suggestions for a future release:
1). Invert-color PDF dark mode harms readability.
Simply invert the color will make serif fonts less readable. I use PDF.js with the following canvas renderer snippet to create a more pleasant reading experience.
```css
#viewerContainer > #viewer > .page > .canvasWrapper > canvas { filter: sepia(23%); filter: saturate(45%); filter: hue-rotate(181deg); filter: brightness(90%); filter: contrast(93%); filter: invert(81%); }
#viewerContainer > #viewer > .spread > .page > .canvasWrapper > canvas { filter: sepia(23%); filter: saturate(45%); filter: hue-rotate(181deg); filter: brightness(90%); filter: contrast(93%); filter: invert(81%); }
```
Try this with this PDF.js extension: https://chrome.google.com/webstore/detail/pdf-reader/ieepebp... by pasting it to the option page.
2). Custom Font support.
As a power user, I'd like to render the article with my personally preferable font (locally installed in most cases.) Why not simply give users the option to set css:font-family? It's really easy to implement.
Anyway, the current product is pleasing enough! I'm already spiritually a paid-user.