We want each of the `ThreadSettingsBlahTab` components to have some padding so their contents aren't right against the edge of the surrounding Modal. However, we **do** want the Tabs to extend all the way to the edges and be closer to the Modal header.
We can't put these divs inside `<Tabs.Container>` because it expects its children to be typed a certain way. As a result we have to copy/paste the `<div className={css.tab_body}>` tag for every tab. We **could** move this padding to the children Tab components themselves, but setting the padding in `ThreadSettingsModal` seems like the right layer of abstraction to me.