Search drop down does not disappear when clicking on a result in the current page

[chenbh]

Steps to reproduce

1. Go on any page (e.g. https://concourse-ci.org/tasks.html)
2. Search for something that's part of the page (e.g. inputs if using Tasks page)
3. Click on the result from the drop down

Expected result

It scrolls to the correct spot and the drop down disappears

Actual result

Additional details

Chrome 72.0