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:

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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;
 
}

<div class="wrap">
  <div class="shape"></div>
  <div class="shape2">This will be where you can place the text to go down the right hand side of the slider</div>
  
</div>

Answer 2

SVG

As Harry suggested in the comments, SVG would be your best option as a double curve in CSS isn't feasible without using multiple elements, pseudo elements or using possibly unsupported CSS3 properties.

SVG stands for Scalable Vector Graphic. The web browser views it as an image but you can add text and normal HTML elements within an SVG.

It is well supported across all browsers as viewable here: CanIUse

<svg width="466" height="603" viewbox="0 0 100 100" preserveAspectRatio="none">
  <path d="M0,0 
           L100,0
           C25,50 50,75 0,100z" fill="#8aa7ca" />
</svg>

• SVG on MDN

CSS

Ofcourse this is still possible with CSS but does take using pseudo elements :before and :after. It is also not best for the curves as it will render them without anti-aliasing

div {
  background: blue;
  width: 50px;
  height: 75px;
  position: relative;
}
div:before {
  content: '';
  background-image: radial-gradient(circle at 100% 100%, rgba(204, 0, 0, 0) 100px, blue 100px);
  position: absolute;
  top: 0;
  left: 100%;
  width: 100px;
  height: 75px;
}
div:after {
  content: '';
  position: absolute;
  width: 50px;
  height: 75px;
  background: blue;
  border-radius: 0 0 100% 0 / 0 0 100% 0;
  top: 100%;
  left: 0;
}

<div></div>

Answer 3

SVG

In svg this can be created using a single path

<svg height="300px" viewBox="0 0 100 100">
  <path fill="CornFlowerBlue" d="M0,0
  100,0
  C50,20 50,80 0,100 Z" />
</svg>