Changing appearence of mainwindow according to end user

[prabhudev]

Hey..I used this,but whatever i give as input.. blue, white,yellow..it sets it as black itself..

void MainWindow::on_Set_clicked()
{
    QString s;
   s=ui->bcolor->text();//textbox from wher i get input from user
    qApp->setStyleSheet("QLineEdit { background-color:s }");
 
}

void MainWindow::on_Set_clicked()
{
    QString s;
   s=ui->bcolor->text();//textbox from wher i get input from user
    qApp->setStyleSheet("QLineEdit { background-color:s }");

}

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