Background image does not work

I am running MPDF version 7 and attribute background-image or background does not work for image.

<div style="width:100%;height:500px;border:0.3pt solid #E57233;margin-top:-1px;background-image:url(hand.jpg);">

MPDF shows div without any background image. Path to file is right because when I use it as a source for img tag, it shows up.

Does anyone know how to fix this?