Copying how question author linked to their own reading material, in public on StackExchange, and gave a Conflict of Interests statement.
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Zoom in to Full Page width, or change Window Size, so PDF reaches edge (with Dark Reader from your question):

For example, on https://www.gao.gov/assets/gao-19-221.pdf (*): Zoom with Dark Reader Google Chrome Extension 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.

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

Zoom with Dark Reader Google Chrome Extension 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.

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

For example, on https://www.gao.gov/assets/gao-19-221.pdf (*): Zoom with Dark Reader Google Chrome Extension 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.

Source Link

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

Zoom with Dark Reader Google Chrome Extension 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.