Draw a curve with css

Question

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:

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

Answer 1

You could use an asymmetrical border to make curves with CSS.

border-radius: 50%/100px 100px 0 0;

VIEW DEMO

.box {    width: 500px;     height: 100px;      border: solid 5px #000;    border-color: #000 transparent transparent transparent;    border-radius: 50%/100px 100px 0 0;  }

<div class="box"></div>