I made a mess with the consolidation of the columns to 2, 1, and .5. Here's an attempt at fixing it, though I may move the .make-*-box() mixins back to being divisible by 12.
okay. i moved it back to /12 because that's how the .make-*-column() mixins work already. too much confusion.
Changing out the right rail to eliminate some border issues that weren't affecting much, but were also showing some mismatches in the design.
This solves the right rail being too wide at the phone size. Tablet is still a work in progress. Unsure how to hit that yet.