Draw a curve with css

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I want to create an animation with css that simulate a wave movement.
I need to change a line-or div- to a curve for this...
The CSS rules that I'm familiar to, make the entire div to semicircular or change element border.
For example: border-radius, or perspective or border-top-radius...
This image show you what I want: curve

Do you have experience about this? or is it possible?
Thanks in Advance...

2 Answers
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