Qt Scroll Area ScrollBars not applying styles

Question

So I have 1 ScrollArea and I have set the stylesheet to be:

QScrollBar { 
    background-color: rgb(29, 29, 29);
    border: 1px Solid white;
    border-radius: 5px;
    margin-right: 4px;
    margin-top: 4px;
    margin-bottom: 4px; 

}
QScrollBar::handle {
    background: white;
    min-height: 0px;
    border: 1px solid white;
    border-radius: 4px;
}

QScrollBar::add-line {
    background: qlineargradient(x1:0, y1:0, x2:1, y2:0, stop: 0 rgb(32, 47, 130), stop: 0.5 rgb(32, 47, 130),  stop:1 rgb(32, 47, 130));
    height: 0px;
    subcontrol-position: bottom;
    subcontrol-origin: margin;
}
QScrollBar::sub-line {
    background: qlineargradient(x1:0, y1:0, x2:1, y2:0, stop: 0  rgb(32, 47, 130), stop: 0.5 rgb(32, 47, 130),  stop:1 rgb(32, 47, 130));
    height: 0 px;
    subcontrol-position: top;
    subcontrol-origin: margin;
}

And when I run the application, the styling doesn't apply. I have tried to edit the margins to 0px and that still doesn't work. It just reverts back to the default styling.