This is really cool and has a lot of potential. Academic papers are dense and heavily cross-referenced, so experimenting with new display formats that do more to help the reader could make researchers a lot more productive. For example, citation tooltips are a big time saver compared to cross-referencing the bibliography. However, it's also beneficial for every paper to look the same because this makes skimming easier. To get both innovation and consistency is to develop tools, like Arxiv Vanity, that automatically transform the source document. This example makes me hopeful that we'll someday have similar tools for the commercial publishers' papers.
As for immediate tweaks, I tentatively suggest making the text 100% black (like the original PDF) instead of rgba(0, 0, 0, 0.8). The higher contrast will help those of us with less-than-great eyes.
As for immediate tweaks, I tentatively suggest making the text 100% black (like the original PDF) instead of rgba(0, 0, 0, 0.8). The higher contrast will help those of us with less-than-great eyes.