div in css --- a large set of left and right div, how to make the most of the minimum of distraction? parent and the distraction it?

 

 Finally, to achieve the effect, but the feeling is still very far-fetched theory, if there are ways Which Great God, oh please comments that

Html:

 

 css:

 

 

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Origin www.cnblogs.com/snowbxb/p/11778105.html