TomTom,
The demo template (
https://initiostar.co.uk/demo/zNivo/#xl_six) has a mobile variant width of 540px; it uses Scale-to-fit-Width with a minimum width of 540px. Should you want to embed this into a main website mobile variant that has a 480px width, you would need to modify the page width in the slider mobile variant to 480px.
E.g.
Simple-Slideshow-Page-Template_480px.xar
You can modify any of the slider page sizes across all variants to suit your design, but as a start point, I would make the main website placeholders the same size as the incoming slider for each variant. The code remains the same.
Hopefully this gets you back on track.
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