fix compile error on win

Zhao Yuhang

2023-12-22 0cedc474f38dca024f77ebf1d7ac5bf22c19744a

 examples/mainwindow/dark-style.qss

@@ -146,6 +146,10 @@
    background-color: #1E1E1E;
}

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

QWidget#clock-widget {
    font-size: 75px;
    color: #FEFEFE;