that sounds like a not-great designer, tbh. Which happens often, what I usually do is not take everything in the design at face value: 28px is actually 32px, which is 8rem, which is `w-something`.

It really needs to be 28px this time for some sorta-legit reason? Fine, add a semantic class (or id) for it that's not part of your tailwind framework, kind of dropping down to "usual" CSS