QMainWindow::separator {
    width: 4px; /* when vertical */
    height: 4px; /* when horizontal */
}

QFrame {
    border: 0px solid green;
}

QMainWindow::separator:hover  {
    background: #696969;
}
QDockWidget::title  {
    text-align: center;
    /* background: #D1D1D1; */
    padding-left: 0px;
}

