Search result tabbing in mobile view - tab focus gets lost after the final search result

[iqbalgds]

Steps to re-create

1. Make sure you have mobile view.

2. Click the grey banner Table of contents
   

3. Enter a search term.

4. Tab through the results.

5. When you reach the final result and press tab, it should go to the browsers URL window.

6. However, the tab focus goes to the close TOC button - which is hidden behind then current DIV.
   So to the user it looks like the tab focus is lost.
   

7. If you press tab again - then it does go to the browser URL.

[iqbalgds]

Raised the following PR to fix this: #224

[iqbalgds]

This has been released - closing issue.