slideshow in full screen mode shows white bars on either side

Question

I placed a slideshow in full screen mode. Works fine from TT's browser FF / Windows 10. I export the theme as folder. Change dev environment to Ubuntu 19.10 / tar.gz theme and install in Drupal. Now, in Ubuntu FF I do not have slideshow in full screen. One white space on either side of the slide show.

Answer 1

Problem solved. In slidebar background click more images select image select stretch