QScrollArea problem with stylesheet

[ChanchoCiego]

Hello, good day,

I'm struggling with the ScrollArea and going very badly,

I have a QScrollArea, and inside a QFrame, I would like to put a fixed background image to the scrollarea but I can't,

the style of the QFrame is this:
@
QFrame#frmCentral
{
background-color: rgba (255, 255, 255, 0); / * background-color: transparent; Neither walked * /
border-top: 0px solid rgb (255, 255, 255);
border-bottom: 0px solid rgb(255, 255, 255);
}
@

and the QScrollArea has this style:

@
QScrollArea
{
background-color: white;
border: transparent rgb(255, 255, 255) 0px;
background-image: url(:/imagenes/fondo_central.png);
background-attachment: fixed;
}
@

in the mainWindow.cpp I have this:
@
ui->frmCentral->setAttribute(Qt::WA_TranslucentBackground);
@

but the background is not visible, what am I doing wrong?

Thanks a lot