fixed white scrollbar at the info window

QtMeshViewer/Source/FileInfoWindow.cpp

@@ -9,7 +9,7 @@ FileInfoWindow::FileInfoWindow(QWidget *parent)
 
 	setWindowFlags(Qt::Tool | Qt::NoDropShadowWindowHint);
 
-	ui->scrollArea->setStyleSheet("background-color: #ffffff");
+	ui->scrollArea->widget()->setStyleSheet("background-color: #ffffff");
 
 }