qt5 行表头和列表头夹角处设置样式

想要在行表头和列表头加角处设置背景色

    model = new QStandardItemModel(this);

    QStringList strHeader;
    strHeader << "时间"<< "总流量"<<"大车流量"<<"小车流量"<<"行人流量"<<"非机动车流量";

    QHeaderView *header = new QHeaderView(Qt::Horizontal,ui->table);
    ui->table->setHorizontalHeader(header);
    model->setHorizontalHeaderLabels(strHeader);


    model->setColumnCount(6);
    model->setRowCount(3);
//    ui->table->verticalHeader()->hide();
    ui->table->setModel(model);

    ui->table->horizontalHeader()->setStretchLastSection(true);
    ui->table->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

QHeaderView::section
{
background:#444444;
color:white;
}