Minor text box rendering issues

[ardgedee]

I usually have to zoom screens to read text. Doing this exposes some cracks in the presentation that aren't visible at default zoom.
Mac OS 10.12.5, Safari Version 10.1.1 (12603.2.4)

• There's a hairline gap between the tab and its box.
• The last line of text in the last comment in a comment box will have its descenders cropped.

Really low priority because this is an edge case and user accessibility isn't impeded. But a good task for CSS beginners.

[bikrambhattacharya]

@ardgedee Need help searched all the files but couldn't find anything MLTSHP/mltshp#425.

[ErinCall]

FWIW this doesn't reproduce in Firefox 56.0.2 on OSX 10.12.6