Css 应用样式表时QScrollbar的qt右侧箭头消失

我正在尝试应用QScrollbar的样式表，右边的箭头没有显示，我无法更改控制柄宽度和条的背景色

有什么能帮我让右箭头出现，改变手柄的宽度和背景色吗

代码：

sliderOne.setStyleSheet("QScrollBar:horizontal {border: 1px solid none;height:15px;margin:0px 20px 0px 20px;} QScrollbar::handle:horizontal {min-width:8px;}");

图片：这是我得到的

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我使用自定义图像实现了我的要求，感兴趣的人可以查看此代码

sliderOne.setStyleSheet("QScrollBar:horizontal {border: 2px solid grey;background: none;height: 15px;margin: 0px 20px 0 20px;} QScrollBar::handle:horizontal {background: gray;min-width: 10px;} QScrollBar::add-line:horizontal {border: 2px solid grey;background: none;width: 20px;subcontrol-position: right;subcontrol-origin: margin;} QScrollBar::add-page:horizontal, QScrollBar::sub-page:horizontal {background: none;} QScrollBar::right-arrow:horizontal {image: url(path/arrow-right-down.png);background: none;} QScrollBar::right-arrow:horizontal:pressed { image: url(path/arrow-right-up.png);background: none;} QScrollBar:left-arrow:horizontal {image: url(path/arrow-left-down.png);background: none;} QScrollBar:left-arrow:horizontal:pressed {image: url(path/arrow-left-up.png);background: none;} QScrollBar::sub-line:horizontal {border: 2px solid grey;background: none;width: 20px;subcontrol-position: left;subcontrol-origin: margin;}");

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样式表要么全有要么全无：一旦应用了样式表，就失去了原来的样式。谢谢kuba。我使用以下代码定制了它。