Per #54 @johnsouth made a good point with scrolling. If you set `maxResultsToShow` to a large number and open the suggestion box with a full unfiltered list you're going to have a very tall list displaying over content beneath it. 

- `max-height` is the size of 10 visible suggestions as the default for `maxResultsToShow` is 10
- `overflow-y: auto` so the suggestion box only gets a scrollbar if it goes over 10.