How can I change the grey background of the PDF preview in Google Chrome to black?

Question

How can I change the grey background of the PDF preview in Google Chrome to black?

For example, on https://arxiv.org/pdf/1808.06394.pdf:

using this code in the console (and disabling the Dark Reader Google Chrome extension if it was enabled):

var cover = document.createElement("div");
let css = `
    position: fixed;
    pointer-events: none;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: white;
    mix-blend-mode: difference;
    z-index: 1;
`
cover.setAttribute("style", css);
document.body.appendChild(cover);

I can make the white background black:

However the background of the PDF preview in Google Chrome is still grey. Instead I would like something such as:

Answer 1

Zoom in to Full Page width, or change Window Size, so PDF reaches edge (with Dark Reader from your question):

Now you still have the "gray color border" imposed by Google Chrome (whose bright idea was that, was it a full thought? We can blame trees for white paper.), but you're not forced to take that as the full version.

Ideally being a Black background would be obvious, computer code would enable us to disable these unconsciously scripted forms to be self-edited, it's not just a form of accessibility, it's about designing to be accessible in the lowest code logic.