How to style QComoBox drop down menu... bad outline

[Dariusz]

Hey
The style :

QComboBox{
background-color: #202020;
border: 0px solid;
border-radius: 5px;
height: 30px;
}

QComboBox QAbstractItemView
{
    border: 1px solid #323232;
    border-radius: 10px;
    background-color: rgba(0,0,0,0.1);
    margin: 10px;
}


QComboBox::drop-down {
    subcontrol-origin: padding;
    subcontrol-position: top right;
    width: 15px;
    border-left-width: 1px;
    border-left-color: rgba(118, 121, 124, 255);
    border-left-style: solid;
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
}

The issue :

you can see that black edge outline around the QAbstractItemView. I can't remove it. Any idea how?