How to make here such perehody between sections?

There is such garbage, how to do it?
The layout further in the opposite direction, tobish and convex and "vkupno"
June 8th 19 at 17:03
2 answers
June 8th 19 at 17:05
There are 2 sections - top and bottom. The top is a picture png, fixed on the lower edge of the upper block on top of all content, or you can play with the transformations in css.
June 8th 19 at 17:07
Solved through basic border-radius

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