QFrame's style cover it's sub items' style, why...plz help me

[491239]

On mac, I have to set my QFrame container border none to hide the edge of container.But windows don't need to.
So I set

QRadioButton {
    border: 1px solid #CBCBCB;
    border-radius: 16px;
    padding-left: 10px;
    background-color: transparent;
    font-size: 14px;
    color: #CBCBCB;
}

QRadioButton:checked {
    border: 1px solid #2FAFD0;
    border-radius: 16px;
    padding-left: 10px;
    background-color: transparent;
    font-size: 14px;
    color: #2FAFD0;
}

#ContentFrame {
    border: none;
}

But my QRadioButtons which in QFrame border style disappeared....
Can somebody help me ? How should I do to hide the edge on Mac and preserve my Buttons' border style?

[491239]

   contentFrame->setFrameShape(QFrame::NoFrame);