如何更改 QLabel 的背景？

如何更改 QLabel 的背景？我有很多标签，所以每个标签都需要单独更改。您需要更改的不是整个 QLabel 类的背景，而是单独更改 1. 如何获取级联表中特定标签的类？

import PyQt5
from PyQt5 import QtCore, QtWidgets, QtGui
from PyQt5.QtWidgets import QApplication, QWidget, QDesktopWidget, QMainWindow, QAction, qApp
from PyQt5.QtGui import QIcon

HEIGHT = 750
WIDTH = 1300
class Menu(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.menubar = parent.menuBar()
        self.file = self.menubar.addMenu('&Опции')


        self.exitAction = QAction(QIcon('cross-exit.ico'), '&Exit', self)
        self.exitAction.setShortcut('Ctrl+Q')
        self.exitAction.setStatusTip('Exit application')
        self.exitAction.triggered.connect(parent.close)

        self.file.addAction(self.exitAction)

    def addMenu(self, actionName, text, command, icon, shortcut=None, statusTip=None) :
        self.actionName = QAction(QIcon(icon), text, self)
        if shortcut:
            self.actionName.setShortcut(shortcut)
        if statusTip:
            self.actionName.setStatusTip(statusTip)
        self.actionName.triggered.connect(command)

        self.file.insertAction(self.exitAction, self.actionName)


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

    def initUI(self):
        self.q = QDesktopWidget().availableGeometry()
        self.r_w, self.r_h = self.q.width(), self.q.height()
        self.setGeometry(self.r_w/2-WIDTH/2, self.r_h/2-HEIGHT/2, WIDTH, HEIGHT)
        self.w = self.size().width()
        self.h = self.size().height()
        print(self.w, self.h)
        self.setFixedSize(1300, 750)
        self.setWindowTitle('Lings')
        self.setWindowIcon(QIcon('Lings.ico'))
        self.label = QtWidgets.QLabel("sdsd", self)
        self.labelAnswer = QtWidgets.QLabel("", self)
        self.l_w, self.l_h = 500, 100
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.labelAnswer.resize(self.l_w, self.l_h)
        self.labelAnswer.move(self.w/2-self.l_w/2, 250)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.resize(self.l_w, self.l_h)
        self.label.move(self.w/2-self.l_w/2, 100)
        self.label.setFont(QtGui.QFont('Verdana', 24))
        self.labelAnswer.setFont(QtGui.QFont('Verdana', 24))
        self.label.setStyleSheet(".QLabel{\n"        //Нужно поменять фон не всему класу QLabel, а индивидуально 1. Как получить класс определенного лейбла в каскадной таблице?
        "background-color: #E0FFFF\n"
        "\n"
        "}")
        self.label.setStyleSheet(".QLabel{\n"
        "background-color: #E0FFFF\n"
        "\n"
        "}")
        self.menu = Menu(self)
        self.menu.addMenu('action', 'New', lambda: SecondWindow(self), 'test.ico', shortcut="Ctrl+D", statusTip="Creating")




        self.show()

class SecondWindow(QWidget):

    def __init__(self, parent=None):
        super().__init__(parent, QtCore.Qt.Window)
        self.initUI()

    def initUI(self):

        self.q = QDesktopWidget().availableGeometry()
        self.r_w, self.r_h = self.q.width(), self.q.height()
        self.setGeometry(self.r_w/2-WIDTH/2, self.r_h/2-HEIGHT/2, WIDTH, HEIGHT)
        self.setFixedSize(1300, 800)
        self.setWindowTitle('Lings2')
        self.setWindowIcon(QIcon('Lings.ico'))
        self.mainLayout = QtWidgets.QVBoxLayout()

        self.buttons = []
        for i in range(5):
            but = QtWidgets.QPushButton('button {}'.format(i), self)
            self.mainLayout.addWidget(but)
            self.buttons.append(but)
        self.setLayout(self.mainLayout)


        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = MainWindow()

    sys.exit(app.exec_())```