That’s exactly what I meant when I said half the page was lopped off.
Perhaps rotate your phone?
It is irritating when pages block zoom (sometimes intentionally but usually as a side effect of working around sizing oddities in some devices/browsers/versions) but here you may have all you need to solve the problem.
Unless you have a smaller device and it is still too wide in landscape orientation.
Certain parts of the past are not worth emulating :)
Making a silly effect on a website to evoke a nostalgic feeling doesn't really have to be accurate, and it'd probably be near-impossible to accurately represent the subtleties of a CRT display without compounding them with the subtleties of LCDs, especially so when the LCDs an end user will be using is an unknown.