|Smaller cellphone screen - LG G Stylo|
You want: to go to the Next or Previous image by clicking a larger area instead of the small buttons provided by Shadowbox.
In small screens the tiny navigation buttons are hidden.
Simple. save and reload the page.
Thanks to http://www.joomla-css.nl/en/ for some good tips on how to make Joomla navigation menu using Bootstrap.
|Larger screen - laptop|