Thank you for fixing the current user highlight (#370 in the below examples).
It seems like the text font is smaller on the new pages. Not sure if the font is actually smaller, or the text is the same size but is now surrounded by increased spacing between the lines giving the impression that the text has shrunk. As I get older and the eyes get weaker, I have a few general issues with user interfaces. One is selecting a default text size that can only be read if you have perfect eyesight. Another is wasting available screen space by spreading small text and graphics across a large area of mostly white space, instead of increasing the text to be as large as possible to fill the available screen area as much as possible.
I just noticed on my monitor that the old screen is using an alternating light blue, dark blue, and thin white stripe for the row background colors. One the new web page, the blue is much less distinct - the light blue is almost white, and the dark blue is now more of a hint of color like the old light blue, leaving the overall impression that the background is an blended off-white and washed out looking background rather than a series of distinct color separations. The result is the colors on the old page visibly "pop" more than the ones on the new page.
Switching the hyperlink color from blue to red is also a bit jarring, simply because it breaks the expectation of the standard coloring expected for links. Red just looks weird compared to blue in this context.
I only read BOINC STATS on a 23" monitor under Win 10 using the Chrome browser, so I cannot comment on what the pages looks like on a phone.
The biggest open issue I still see with the new pages is the column titles on the user stats pages. The column headers (last month ↓ ↑ / last week ↓ ↑ / last day ↓ ↑ / etc.) on the classic page remains pinned and visible at the top of the screen while scrolling up and down the 100 users listed. On the new version, the header is only displayed at the very top and bottom, but is not seen when scrolling around the middle of the user listing. So now you have to remember what each column represents, especially if you are spending a lot of time comparing users at the center of the list because that is where your listing happens to land at the time on the page.
Compare the header on these two pages while scrolling up up and down:
https://www.boincstats.com/stats/14/user/list/0/300#370
https://classic.boincstats.com/en/stats/14/user/list/0/300#370