update demo code

Zhao Yuhang

2024-09-15 f645ae48cda10b80ffe9d83ba9487671c7f535c0

 examples/mainwindow/dark-style.qss

@@ -37,7 +37,7 @@

QWK--WindowBar>QAbstractButton#min-button:hover,
QWK--WindowBar>QAbstractButton#min-button:pressed {
    background-color: rgba(0, 0, 0, 15%);
    background-color: rgba(255, 255, 255, 15%);
}

QWK--WindowBar>QAbstractButton#max-button {
@@ -47,7 +47,7 @@

QWK--WindowBar>QAbstractButton#max-button:hover,
QWK--WindowBar>QAbstractButton#max-button:pressed {
    background-color: rgba(0, 0, 0, 15%);
    background-color: rgba(255, 255, 255, 15%);
}

QWK--WindowBar>QAbstractButton#close-button {