Creating s-shaped curve using css

Question

I want to create a curve as shown in below image using css.

I was trying something like this:

Answer 1

You could make this using pure CSS if you so wished.

Demo

This uses a large box shadow to create the second curve:

.wrap {
  position: relative;
  height: 400px;
  width: 100%;
  margin: 0 auto;
  max-width: 1024px;
}
.shape {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 50%;
  overflow: hidden;
  z-index: 10;
}
.shape:after {
  content: "";
  position: absolute;
  top: 10%;
  left: 0;
  width: 100%;
  height: 90%;
  border-radius: 0 50% 0 0;
  box-shadow: 0 0 0 999px lightgray;
}
.shape2 {
  position: absolute;
  top: 0;
  left: 50%;
  height: 100%;
  width: 50%;
  background: lightgray;
  border-radius: 0 0 0 50%;
  z-index: 10;
}

/******************************/

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  vertical-align: top;
  overflow: hidden;
  background: cornflowerblue;
 
}

  

  
This will be where you can place the text to go down the right hand side of the slider