qt在QTextBrowser设置样式表水平滚动条样式

可以通过样式表来设置QTextBrowser的水平滚动条的样式。以下是一个示例：

from PyQt5.QtWidgets import QApplication, QTextBrowser
from PyQt5.QtCore import Qt

app = QApplication([])
text_browser = QTextBrowser()

# 设置样式表
style_sheet = """
QTextBrowser {
    background-color: #f0f0f0;
    color: #333;
    font-size: 14px;
}

QScrollBar:horizontal {
    border: none;
    background: #f0f0f0;
    height: 10px;
    margin: 0px 20px 0 20px;
}

QScrollBar::handle:horizontal {
    background: #c0c0c0;
    min-width: 20px;
}

QScrollBar::add-line:horizontal {
    border: none;
    background: #f0f0f0;
    width: 20px;
    subcontrol-position: right;
    subcontrol-origin: margin;
}

QScrollBar::sub-line:horizontal {
    border: none;
    background: #f0f0f0;
    width: 20px;
    subcontrol-position: left;
    subcontrol-origin: margin;
}
"""

text_browser.setStyleSheet(style_sheet)
text_browser.setPlainText("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec fringilla ex eu libero auctor, a suscipit purus lacinia. Quisque vel purus odio. Sed in dui consectetur, vestibulum massa a, bibendum mauris. Duis euismod mauris a lectus vehicula, in faucibus justo pellentesque. Vestibulum posuere risus sit amet neque bibendum, id lacinia ipsum venenatis. Praesent commodo, lorem at bibendum tristique, eros urna vulputate augue, eget lacinia nisi purus a tellus. Donec pulvinar lectus ac consequat congue. Nullam rutrum dolor vel massa bibendum, id lacinia lacus fermentum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Ut faucibus velit quis metus tincidunt, sit amet malesuada magna bibendum. Fusce nec eros eget leo suscipit bibendum. Nunc eget magna euismod, tempor sapien eget, commodo dolor. ")

text_browser.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
text_browser.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)

text_browser.show()
app.exec_()

这个样式表将QTextBrowser的背景色设置为灰色，文本颜色设置为深灰色，字体大小设置为14px。水平滚动条的高度设置为10px，滑块的最小宽度设置为20px，滑块的背景色设置为浅灰色。增加按钮和减少按钮的宽度都设置为20px，背景色都设置为浅灰色。