optimize mac again

Yuhang Zhao

2023-12-18 326b23bf678301a72cb9d67ac64347dd5ce49a37

 examples/mainwindow/dark-style.qss

@@ -16,6 +16,7 @@
    border: none;
    color: #ECECEC;
    background-color: transparent;
    min-height: 28px;
}