I have a similar situation in a Jack and Jill bath. It's narrow and the vanities are a 1980s light beige cultured marble. I wanted a light gray LVT but couldn't find one that would tie in with the brown tone. Coreluxe just introduced one called pewter travertine. It is mostly light gray with a little bit of beige. LL flooring (Lumber Liquidators) has it on sale (slightly) for $1.89 per sq ft until August 17th.

https://www.llflooring.com/p/coreluxe-4mm-w-pad-pewter-travertine-waterproof-rigid-vinyl-plank-flooring-12.01-in.-wide-x-24-in.-long-10051042.html

If you haven't looked at Supercore, check the site and ask for samples. I used it in my basement. Excellent quality and great customer service.