Background Image not working in Power BI Embedded Mobile View

I created a background image for my Power BI Report because I want the report to look nicer (added shadow, more 3D effects, which can't be done in Power BI itself). It works well in Power BI Desktop as well as in Power BI Service, it looks nice even when I embed the report in a web app using Power BI Embedded.

However, thing started to break when I optimise the web app for mobile use and added phone layout for my report, the report background started to squeeze and looks horrible in the web app.

As you can see in a mobile optimise report (phone layout), the background image looks horrible?

Is there any workaround for this?

Or how can I disable background image for mobile view only?

In desktop:

In mobile (looks really weird):

Hope someone could shed some light. Thanks in advance!