Your background is too clean. No respectable 90's webpage would be caught without the repeating patterned background.<p><a href="https://creativemarket.com/blog/90s-web-designs" rel="nofollow">https://creativemarket.com/blog/90s-web-designs</a>
Love it.
I at first wrote that it should be fixed width at 800 or 640; though I guess that depends on whether you want to be accurate to the actual code of the 90's or the way it looked to users.