How to change top bar in PyQT5 (PySide2)?

Question

PyQt

Here is the application code:

design.py:

# -*- coding: utf-8 -*-

################################################################################
## Form generated from reading UI file 'design.ui'
##
## Created by: Qt User Interface Compiler version 5.15.2
##
## WARNING! All changes made in this file will be lost when recompiling UI file!
################################################################################

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *


class Ui_Dialog(object):
    def setupUi(self, Dialog):
        if not Dialog.objectName():
            Dialog.setObjectName(u"Dialog")
        Dialog.resize(260, 330)
        Dialog.setStyleSheet(u"background-color: qlineargradient(spread:pad, x1:0.59, y1:0.988636, x2:0.334, y2:0.182045, stop:0 rgba(21, 25, 41, 246), stop:1 rgba(43, 47, 64, 232));")
        self.pushButton = QPushButton(Dialog)
        self.pushButton.setObjectName(u"pushButton")
        self.pushButton.setGeometry(QRect(50, 160, 161, 41))
        font = QFont()
        font.setFamily(u"Arial")
        font.setPointSize(10)
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        font.setStrikeOut(False)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet(u"QPushButton {\n"
"	color: rgb(255, 255, 255);\n"
"	background-color: rgb(217, 76, 76);\n"
"	border-radius: 5px;\n"
"}\n"
"\n"
"QPushButton:hover {\n"
"	background-color: rgb(167, 58, 58);\n"
"}\n"
"")

        self.label = QLabel(Dialog)
        self.label.setObjectName(u"label")
        self.label.setGeometry(QRect(100, 210, 51, 51))
        font1 = QFont()
        font1.setFamily(u"Arial")
        font1.setPointSize(20)
        self.label.setFont(font1)
        self.label.setStyleSheet(u"color: rgb(255, 255, 255);\n"
"background-color: rgb(255, 255, 255,0);")
        self.lineEdit = QLineEdit(Dialog)
        self.lineEdit.setObjectName(u"lineEdit")
        self.lineEdit.setGeometry(QRect(40, 40, 181, 31))
        font2 = QFont()
        font2.setPointSize(15)
        font2.setBold(True)
        font2.setWeight(75)
        self.lineEdit.setFont(font2)
        self.lineEdit.setStyleSheet(u"color: rgb(255, 255, 255);\n"
"border-radius: 5px;\n"
"background-color: rgb(33, 37, 65);")
        self.lineEdit.setPlaceholderText("Введите город!")

        self.retranslateUi(Dialog)

        QMetaObject.connectSlotsByName(Dialog)
    # setupUi

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QCoreApplication.translate("Dialog", u"Dialog", None))
        self.pushButton.setText(QCoreApplication.translate("Dialog", u"\u0423\u0437\u043d\u0430\u0442\u044c \u041f\u043e\u0433\u043e\u0434\u0443", None))
        self.label.setText(QCoreApplication.translate("Dialog", u"+20", None))
    # retranslateUi

main.py:
import sys
from pyowm.owm import OWM

from PySide2 import QtCore, QtGui, QtWidgets

from design import Ui_Dialog


app = QtWidgets.QApplication( sys.argv )
# app.setStyle('Breeze')

Dialog = QtWidgets.QDialog()
ui = Ui_Dialog()
ui.setupUi( Dialog )
Dialog.show()


#Hook logic
def get_weather_city():
    print("работает")

    owm = OWM( Token )
    city = ui.lineEdit.text()
    mgr = owm.weather_manager()
    observation = mgr.weather_at_place( city )
    w = observation.weather

    t = w.temperature( "celsius" )["temp"]

    print(t)
    ui.label.setText( str(t) )
   
ui.pushButton.clicked.connect(get_weather_city)


sys.exit(app.exec_())

There is also a screenshot from QtDesigner


How can I change this top bar and make it familiar to Shind?