Grid.css -a grid CSS file can have your layout structure (and act as the wireframe of your site, by defining the basic header, footer, and column set up).
css—grid css文件被用来组织布局和结构。通过定义基本的头部，底部和列设置为你网站的创建轮廓，线框模型(winframe)。
While some designers may give set widths to certain elements in fluid layouts, such as margins, the layout in general USES percentage widths so that the view is adjusted for each user.
尽管大多数设计师会给流动布局内某些特定元素(如外边距和内留白)以固定宽度，整个布局大体上还是使用百分比宽度，并根据用户不同而自动调整实际宽度。
On the other hand, if you're starting with a data set, such as fields that must be completed in a database, start by designing the data model first, and then create the form layout.
相反，如果需要从数据集(比如在数据库中必须完成的字段)开始，则最好首先设计数据模型，然后再创建表单布局。
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