Hi
I don't think Qt stylesheet supports even half of this
#style-9::-webkit-scrollbar-track
{
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
background-color: #F5F5F5;
}
so you best bet is to dig into
https://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qscrollbar
and see how close you can get it.