首先创建一个QFrame，然后进行QFrame的嵌套。
共三个QFrame，让他们堆叠，然后使用qss进行样式的重组

页面代码如下

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

# Form implementation generated from reading ui file '.\untitled.ui'
#
# Created by: PyQt5 UI code generator 5.15.7
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 260)
        Form.setStyleSheet("#frame{\n"
                           "    background-color: rgb(255, 255, 255, 0);\n"
                           "}")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_2.setSpacing(0)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.frame = QtWidgets.QFrame(Form)
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.verticalLayout_5 = QtWidgets.QVBoxLayout(self.frame)
        self.verticalLayout_5.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_5.setSpacing(0)
        self.verticalLayout_5.setObjectName("verticalLayout_5")
        self.verticalLayout_4 = QtWidgets.QVBoxLayout()
        self.verticalLayout_4.setObjectName("verticalLayout_4")
        self.frame_2 = QtWidgets.QFrame(self.frame)
        self.frame_2.setMinimumSize(QtCore.QSize(0, 40))
        self.frame_2.setMaximumSize(QtCore.QSize(400000, 40))
        self.frame_2.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_2.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_2.setObjectName("frame_2")
        self.verticalLayout_3 = QtWidgets.QVBoxLayout(self.frame_2)
        self.verticalLayout_3.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_3.setSpacing(0)
        self.verticalLayout_3.setObjectName("verticalLayout_3")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setContentsMargins(2, 2, 2, 2)
        self.horizontalLayout.setSpacing(2)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(self.frame_2)
        self.label.setMinimumSize(QtCore.QSize(0, 30))
        self.label.setMaximumSize(QtCore.QSize(16777215, 30))
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout.addItem(spacerItem)
        self.toolButton_3 = QtWidgets.QToolButton(self.frame_2)
        self.toolButton_3.setMinimumSize(QtCore.QSize(30, 30))
        self.toolButton_3.setMaximumSize(QtCore.QSize(30, 30))
        self.toolButton_3.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.toolButton_3.setText("")
        self.toolButton_3.setObjectName("toolButton_3")
        self.horizontalLayout.addWidget(self.toolButton_3)
        self.toolButton_2 = QtWidgets.QToolButton(self.frame_2)
        self.toolButton_2.setMinimumSize(QtCore.QSize(30, 30))
        self.toolButton_2.setMaximumSize(QtCore.QSize(30, 30))
        self.toolButton_2.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.toolButton_2.setText("")
        self.toolButton_2.setObjectName("toolButton_2")
        self.horizontalLayout.addWidget(self.toolButton_2)
        self.toolButton = QtWidgets.QToolButton(self.frame_2)
        self.toolButton.setMinimumSize(QtCore.QSize(30, 30))
        self.toolButton.setMaximumSize(QtCore.QSize(30, 30))
        self.toolButton.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.toolButton.setText("")
        self.toolButton.setObjectName("toolButton")
        self.horizontalLayout.addWidget(self.toolButton)
        self.verticalLayout_3.addLayout(self.horizontalLayout)
        self.verticalLayout_4.addWidget(self.frame_2)
        spacerItem1 = QtWidgets.QSpacerItem(218, 118, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout_4.addItem(spacerItem1)
        self.frame_3 = QtWidgets.QFrame(self.frame)
        self.frame_3.setMinimumSize(QtCore.QSize(0, 40))
        self.frame_3.setMaximumSize(QtCore.QSize(16777215, 40))
        self.frame_3.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_3.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_3.setObjectName("frame_3")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.frame_3)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setSpacing(0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setSpacing(0)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.pushButton = QtWidgets.QPushButton(self.frame_3)
        self.pushButton.setMinimumSize(QtCore.QSize(0, 40))
        self.pushButton.setMaximumSize(QtCore.QSize(16777215, 40))
        self.pushButton.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout_2.addWidget(self.pushButton)
        spacerItem2 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout_2.addItem(spacerItem2)
        self.verticalLayout.addLayout(self.horizontalLayout_2)
        self.verticalLayout_4.addWidget(self.frame_3)
        self.verticalLayout_5.addLayout(self.verticalLayout_4)
        self.verticalLayout_2.addWidget(self.frame)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "TextLabel"))
        self.pushButton.setText(_translate("Form", "PushButton"))


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

Qss代码

* {
    font: 12pt '黑体';
}

#WinFrame {
    border-image: url("1672792032765.png");
    border-radius: 10px;
}
#WinFrame:hover{
    background-size: 410px 240px;
}

#frame {
    background-color: rgb(255, 255, 255, 0);
    border-radius: 10px;
}

#frame_2 {
    border-radius: 10px;
    background-color: qlineargradient(spread:pad,
    x1: 0,
    y1: 1,
    x2: 0,
    y2: 0,
    stop: 0 rgba(0, 0, 0, 0.09),
    stop: 1 rgba(26, 23, 23, 0.7));
}

#frame_3 {
    border-radius: 10px;
    background-color: qlineargradient(spread:pad,
    x1: 0,
    y1: 1,
    x2: 0,
    y2: 0,
    stop: 0 rgba(26, 23, 23, 0.73)
    stop: 1 rgba(0, 0, 0, 0.06),);
}

QToolButton {
    border-radius: 15px;
    background-color: rgba(26, 23, 23, 0.77);
}
QToolButton:hover{
    background-color: rgba(217, 125, 48, 0.66);
}

QLabel {
    color: white;
}

QPushButton {
    border-radius: 15px;
    font-size: 25px;
    color: white;
}

QPushButton:hover {
    color: rgba(220, 234, 23, 0.84);
}

对事件的连接预处理

from PyQt5.Qt import *
import sys
from untitled_ui import Ui_Form


class Button(QFrame, Ui_Form):
    click = pyqtSignal()

    def __init__(self, *args, **kwargs):
        super(Button, self).__init__(*args, **kwargs)
        # 鼠标跟踪
        self.setMouseTracking(True)
        self.setObjectName('WinFrame')
        self.resize(400, 225)
        # 安装事件过滤器
        self.installEventFilter(self)

        with open('a.css', mode='r', encoding='utf-8') as fp:
            self.setStyleSheet(fp.read())
        # 设置边距
        self.setContentsMargins(0, 0, 0, 0)
        self.qhb = QHBoxLayout(self)
        self.qhb.setContentsMargins(0, 0, 0, 0)
        self.qframe = QFrame(self)

        self.setupUi(self.qframe)
        self.frame.close()
        self.pushButton.setIcon(QIcon('1.png'))
        self.pushButton.setIconSize(QSize(35, 35))
        self.qhb.addWidget(self.qframe)

    def enterEvent(self, evt: QEvent) -> None:
        """
        鼠标进来了
        :param evt:
        :return:
        """
        self.frame.show()

    def leaveEvent(self, evt: QEvent) -> None:
        """
        鼠标出去了
        :param evt:
        :return:
        """
        self.frame.close()

    def eventFilter(self, obj: 'QObject', evt: 'QEvent') -> bool:
        """
        监控事件
        :param obj:
        :param evt:
        :return:
        """
        if obj.objectName() == self.objectName():
            if evt.type() == QEvent.Type.MouseButtonDblClick:
                # 双击事件
                self.click.emit()
        return super(Button, self).eventFilter(obj, evt)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = QWidget()
    win.resize(500, 500)
    but = Button(win)
    but.move(50, 50)
    but.click.connect(lambda: print('1'))
    win.show()
    sys.exit(app.exec_())

效果图如下：