How to make waves according to the example?

Question

css

Hello.
Tell me how to implement a wave effect in the background and to crop the background as in

picture

.
I already searched the Internet for a solution but nothing works.
I need urgent help please.

Answer 1

This is an image, native only if the CSS is perverted, but I highly do not recommend this.
Therefore, you take a picture and upload it to the site. If you want adaptability, I recommend a vector (SVG), as you wrote above.