This has more to do with a gutter. Not related to the baseline itself.

I was going to document that bit of code and changing it to:

```scss
// Highlight the targetted Comment.
// ie: http://path/to/url#comment-123
//     highlights comment with ID 123
.d-comment:target > .d-comment__inner {
    background: $mushroom;

    $highlightBleedingOffset: $gutter/4;
    padding-left: $highlightBleedingOffset;
    padding-right: $highlightBleedingOffset;
    margin-left: $highlightBleedingOffset * -1;
    margin-right: $highlightBleedingOffset * -1;
}
```

What do you think?