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Solved!
tableWidget->setStyleSheet("QTableView::item:selected { color:white; background:#000000; font-weight:900; }" "QTableCornerButton::section { background-color:#232326; }" "QHeaderView::section { color:white; background-color:#232326; }");
http://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qtableview http://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qheaderview
try:
QHeaderView::section { background-color: rgb(255, 255, 255); border: none; height: 32px; }