Gallery picture scale problem on mobile devices

Hi,

I am having trouble in displaying galleries on mobile devices.

I insert galleries with the following code diretly with your plugin into my blog posts. Images are perfectly fitted to the width of my blog. One row should show two images next to each other.

[su_custom_gallery source=”media: 19183,21262″ link=”lightbox” width=”408″ height=”278″]

Works fine on laptop and bigger screens, but:

1.
when showing the preview on mobile phones only one image is in a row, what’s ok, however images are not scalled correctly. Images show up stretched or shrunked.

2.
on tablets only one image shows in one row (instead of two), too and it is left aligned, not centered. Scale is correct though.

Thanks.

https://wordpress.org/plugins/shortcodes-ultimate/