Creating s-shaped curve using css - html

Question

I want to create a curve as shown in below image using css.
I was trying something like this:
.curve {
background-color: #8aa7ca;
height: 65px;
width: 160px;
-moz-border-radius-bottomright: 25px 50px;
border-bottom-right-radius: 25px 50px;
}
<div class="curve">
<p>This is a sample text.</p>
</div>
Please help me

Answer 1

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 2

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>

Answer 3

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 4

I had a similar requirement but found the CSS for this task to be far too complex for my knowledge level. So, instead, I used an online wave generator.
With that, you can draw the wave you need and generate the SVG.
Then all you have to do is just copy-paste code for the generated wave.
This is the one I used:
svg wage generator