Changed content margins

labelme.py

@@ -94,12 +94,13 @@ class MainWindow(QMainWindow, WindowMixin):
         self.labelList.itemChanged.connect(self.labelItemChanged)
 
         listLayout = QVBoxLayout()
+        listLayout.setContentsMargins(0, 0, 0, 0)
         listLayout.addWidget(self.labelList)
         self.editButton = QToolButton()
         self.editButton.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
         self.labelListContainer = QWidget()
         self.labelListContainer.setLayout(listLayout)
-        listLayout.addWidget(self.editButton)
+        listLayout.addWidget(self.editButton)#, 0, Qt.AlignCenter)
         listLayout.addWidget(self.labelList)