How do you feel about doing this for the .pack-switch style:

```css
.aside.end .pack-switch {
  margin-right: 1.5rem;
}
```
(so, removing the previous padding-right since that does not seem to do anything anyway and adding the margin-right instead)

that way, the `li .aside.end` style does not need to change, and the .pack-checkbox -1.5rem change  and the .aside.start can be removed too. So, the end result is just the .aside.start margin change. Usually, negative margins give me pause, and I try to avoid them where I can. Not always possible, but seems like we could avoid it here.