With LineNumbersInTable enabled, highlighted line numbers have wrong height

With `LineNumbersInTable` enabled, if the inherited CSS line height is greater than one, then the height of highlighted numbers is not equal to the height of the highlighted code.


@willfaught suggested the following fix:

```css
.chroma .lntable .lnt,
.chroma .lntable .hl {
display: flex;
}
```

And while the body is open, perhaps we could make the second column take up the remaining width. You can see the difference above.

Using the [adjacent sibling combinator](https://developer.mozilla.org/en-US/docs/Web/CSS/Adjacent_sibling_combinator):

```css
.lntable .lntd + .lntd {
width: 100%;
}
```

With both of these changes: