How to make hollows and hills through css?

You need to make a website ,whose structure is similar to that in the figure.How to make these depressions between the blocks ? If possible ,without the crutches please . All a good day ?5df91cc23e4e0927289887.png
April 3rd 20 at 18:26
1 answer
April 3rd 20 at 18:28
In principle this is possible with CSS. But too laborious for free help. This can be implemented using multiple gradient backgrounds.

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