update demo code

Zhao Yuhang

2024-09-15 f645ae48cda10b80ffe9d83ba9487671c7f535c0

 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 {