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int main(int argc, char* argv[])
{
   QApplication app(argc,argv);
   QSplitter split(Qt::Vertical);
   split.setStyleSheet("QSplitter::handle:horizontal{color:red;} QSplitter::handle:vertical{color:red;}");
   QTextEdit *text1 = new QTextEdit(&split);
   QTextEdit *text2 = new QTextEdit(&split);
   QTextEdit *text3 = new QTextEdit(&split);
   split.show();
   return app.exec();
}

split.setStyleSheet("QSplitter::handle{background:red;}");