panel类将把元素的边界设为设备框的大小，添加10个像素的填充，并且设置页面的背景颜色和条纹。

The panel class sets the element's border to the size of the device box, adds 10 pixels of padding, and puts the background color and pinstripes on the page.

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panel类将把元素的边界设为设备框的大小，添加10个像素的填充，并且设置页面的背景颜色和条纹。

The panel class sets the element's border to the size of the device box, adds 10 pixels of padding, and puts the background color and pinstripes on the page.

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