MP6 – how to make table scrollable horiziontally?

For my plugin “Leaflet Maps Marker” I use a table with class=”widefat” in admin area for entering the map data. Problem is than when the admin page is viewed on a small device, the table becomes unscrollable horizontally and therefore the marker cannot be set. See example here: http://pro.mapsmarker.com/widefat-table.png

How do I change the table to become horizontally scrollable on WP3.8/MP6?
Thanks for any help!

Robert