给窗口添加样式

app = QApplication(sys.argv)
w = MainWindow()
w.setStyleSheet("""
QTableView {
alternate-background-color: #FAFAFA;
border: none;
}

QHeaderView::section {
background-color: rgb(255, 255, 255);
border: none;
height: 32px;
font-style: normal;
font-weight: normal;
font-size: 15px;
}

QHeaderView::section:horizontal {
border-bottom: 1px solid #F2F2F2;
border-right: 1px solid #F2F2F2;
padding-left: 15px;
}
""")