Background effect in CSS

Issue

I found this site: https://jonasreymondin.com/ (It isn't mine, It just random site I found)

In the background there is a strange effect, I have no idea what it's called or how to do it, does anyone know anything?

I am talking about dot/glitch effect (you have to be careful to notice it), not the parallax effect.

I found this line of code, by deleting this line the effect disappears:

<canvas class="grain" width="976" height="927"></canvas>

I search in the code what that tag do but I don't found anything.

Solution

It is a canvas code, if it is an external plugin you may need to install it or else you need to copy the code.

Ref Link

Answered By - Shreyas D