how to add transparent img in stylesheet problem?

[Suhel]

my pushbutton11 image is transparent png image but qt set white in transparent area  and this is my button image png

[Suhel]

@Suhel sorry my problem is solve my first stylesheet line is this --> /background-image: url({Url}{val}.png) ;
and replace this line to this line -->background: url({Url}{val}.png) transparent;