I did.
Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow)
  4. {
  5.     ui->setupUi(this);
  6.  
  7.     imageLabel = new QLabel;
  8.     imageLabel->setBackgroundRole(QPalette::Base);
  9.     imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
  10.     imageLabel->setScaledContents(true);
  11.  
  12.     scrollArea = new QScrollArea;
  13.     scrollArea->setBackgroundRole(QPalette::Dark);
  14.     scrollArea->setWidget(imageLabel);
  15.     setCentralWidget(scrollArea);
  16.     statusBar()->addWidget(ui->frame, 9);
  17.     statusBar()->addWidget(ui->spinBoxZoom, 1);
  18.     ui->frame->setFocus();
  19.     //ui->mainToolBar->setStyleSheet("QToolBar{background-color: rgb(60,60,60);}");
  20.     ui->mainToolBar->setBackgroundRole(QPalette::Window);
  21. }
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