在头脑中，始终要有这样的认识：背景图像只是显示一个可供内容填充的有效空间(即内容区域和padding，称为doorway)。
Keep in mind that background images only show in the available "doorway" of the element to which they're applied (content area + padding).
在头脑中，始终要有这样的认识：背景图像只是显示一个可供内容填充的有效空间(即内容区域和padding，称为doorway)。
Keep in mind that background images only show in the available "doorway" of the element to which they're applied (content area + padding).
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