can't remove right padding

[mcandre]

.hyper.js:

...
padding: '0 0 0 0',
...

The left column of terminal content is fairly flush with the top and left edges. But the right side of the terminal continues to exhibit extra space even with the above settings.

Padding? Margin? Which CSS selector(s) are relevant there?

The extra space on the right side is roughly the width of a character.

When tiling Hyper with Rectangle back and forth, stretching it quickly from the top half of my MacBook Pro display to the right half, I see the padding briefly disappear (yay!) then just as quickly reappear (boo!). Perhaps some kind of dimension event logic is neglecting to respect the configured padding settings.