How to change the appearance of the deposit by css Qt Designer

[courtlanda]

How to change the external appearance of QTabWidget with qs (specifically top-down).

[shizuka]

I'm not sure I understood you correctly, but

enum QTabWidget:TabShape

This type of listing defines the form of the deposit:

QTabWidget:Triangular The deposits have a triangle view.

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):

def setupUi(self, MainWindow):

MainWindow.setObjectName("MainWindow")

MainWindow.resize(440, 400)

self.centralwidget = QtWidgets.QWidget(MainWindow)

self.centralwidget.setObjectName("centralwidget")

self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)

self.verticalLayout.setObjectName("verticalLayout")

self.qtabwidget = QtWidgets.QTabWidget(self.centralwidget)

self.qtabwidget.setObjectName("qtabwidget")

self.tab = QtWidgets.QWidget()

self.tab.setObjectName("tab")

self.qtabwidget.addTab(self.tab, "")

self.tab_2 = QtWidgets.QWidget()

self.tab_2.setObjectName("tab_2")

self.qtabwidget.addTab(self.tab_2, "")

self.verticalLayout.addWidget(self.qtabwidget)

MainWindow.setCentralWidget(self.centralwidget)
    self.retranslateUi(MainWindow)
    self.qtabwidget.setCurrentIndex(0)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

def retranslateUi(self, MainWindow):
    _translate = QtCore.QCoreApplication.translate
    MainWindow.setWindowTitle(_translate("MainWindow", "Изменить форму вкладок QTabWidget"))
    self.qtabwidget.setTabText(self.qtabwidget.indexOf(self.tab), _translate("MainWindow", "Tab 1"))
    self.qtabwidget.setTabText(self.qtabwidget.indexOf(self.tab_2), _translate("MainWindow", "Tab 2"))

class Window(QtWidgets.QMainWindow, Ui_MainWindow):

def init(self):

super().init()

self.setupUi(self)
    self.tab_3 = QtWidgets.QWidget()
    self.tab_3.setObjectName("tab_3")
    self.qtabwidget.addTab(self.tab_3, "Tab 3")

    # изменяет форму вкладок QTabWidget
    tab_shape = QtWidgets.QTabWidget.Triangular
    self.qtabwidget.setTabShape(tab_shape)

StyleSheet = '''

QTabWidget {

background-color: green;

}

QTabWidget::pane {

border: 1px solid #31363B;

padding: 2px;

margin:  0px;

}

QTabBar {

border: 0px solid #31363B;

color: yellow;

}

QTabBar::tab:top:selected {

color: red;

}

'''
if name == 'main':

app = QtWidgets.QApplication(sys.argv)

app.setStyleSheet(StyleSheet)

app.setFont(QtGui.QFont("Times", 12, QtGui.QFont.Bold))

w = Window()

w.show()

sys.exit(app.exec_())