^{Find out more CSS tricks at css-tip.com}

A quick trick to create any kind of shape having rounded corners.

1. Build the shape

For this task, we simply use clip-path. You can rely on the following tool to do it: https://bennettfeely.com/clippy/. You will find a lot of predefined shapes and you can build yours using drag & drop.

2. Round the corners

For this task we apply the following SVG filter:

<filter id="round">
  <feGaussianBlur in="SourceGraphic" stdDeviation="5" result="blur" />
  <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 19 -9" result="goo" />
  <feComposite in="SourceGraphic" in2="goo" operator="atop"/>
</filter>

filter:url(#round);

That's it!

We can apply any kind of background to our shape. The shape is defined using pseudo-element because we cannot directly apply the filter to an element having clip-path. We need to apply it to a parent container.

We can also control the radius by adjusting the stdDeviation of the filter.

This trick is not only limited to clip-path shapes. It can also work with

Multiple elements shapes:

Multiple background shapes:

and so on.

Simply build your shape as you know and apply the filter to the uppermost container

_{The SVG filter is taking from the following article: https://css-tricks.com/gooey-effect/}