How to fix the background image on mobile?

Hi guys I made a Mx mobile application whereby I placed an static image inside a layout grid of a page. This suits the page perfect, so no scrollbar visible on device. But the problem is that it could be moved by holding (touching) it to above or so, and the white background becoming visible.  When you stop holding it, it goes back to its fixed, initial state. So i am now wondering how I disable this behaviour? Anyone a (CSS) solution?
1 answers

The link above has an answer on how to disable dragging of an image on a web page.

<img src="asdf.png" ondragstart="return false"/>

The code above disables dragging of an image.