不要在一个非最近父元素的祖先元素上设置尺寸。
Do not set dimensions on an ancestor that is not an immediate parent.
在那篇文章中，你将能找到如何设置文档合适尺寸和分辨率的细节。
In that article you will also find specifications on how to set up your files at the proper size and resolution.
一定要设置元素本身，或它的块级父元素的尺寸。
Be sure to set the dimensions on the element itself, or a block-level parent.
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