设置按钮的宽度只是稍微复杂一点：复制矩形的宽度并在元素中增加了一个单位，为矩形的边框留下位置。

Fixing the button's width is only slightly more complicated: the width is copied as is on the rectangle, but incremented by one unit on the element to leave room for the rectangle's stroke.

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要去除这些边框，设置- outline属性为与填充色相同即可；要加宽边框，使用- width属性来指定宽度(用像素表示)。

To remove these borders, set the -outline property to be the same as the fill color; to widen the borders, use the -width property to specify their width in pixels.

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注意，第一次在浏览器中加载该页时，上面的控件具有自己的宽度为2个像素的绿色边框，如在页的声明性标记中设置的一样。

Note that when you first load the page in a browser, the upper control has its own green border with a width of 2 pixels, as set in the declarative markup for the page.

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