Масштаб страницы PyQt5.QtWebEngineWidgets

Вот код:

import sys
from PyQt5.QtWidgets import*
from PyQt5.QtGui import*
from PyQt5.QtCore import*
from PyQt5.QtWebEngineWidgets import *
from PyQt5.QtWidgets import QApplication

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)

        wid = QWidget()
        self.lay = QVBoxLayout()
        wid.setLayout(self.lay)
        self.setCentralWidget(wid)
        self.initUi()

    def initUi(self):
        self.url_serach = QLineEdit()
        self.web = QWebEngineView()

        self.url_serach.returnPressed.connect(lambda: self.load(self.url_serach.text()))

        self.lay.addWidget(self.url_serach)
        self.lay.addWidget(self.web)

    def load(self, url):
        self.web.load(QUrl(url))
        self.url = url


app = QApplication(sys.argv)
win = MainWindow()
win.show()
sys.exit(app.exec_())

Как регулировать размер страницы открытой в QWebEngineView?