Add notification observer on Mac

SineStriker

2023-12-27 88b5b56b6a67d93208eae3980af2f30da09dd8ae

 examples/mainwindow/light-style.qss

@@ -140,12 +140,12 @@

/* Window */

MainWindow[custom-style=true] {
    background-color: transparent;
MainWindow {
    background-color: #F3F3F3;
}

MainWindow[custom-style=false] {
    background-color: #F3F3F3;
MainWindow[custom-style=true] {
    background-color: transparent;
}

QWidget#clock-widget {