How to make a transparent background in canvas?

Question

JavaScript

Good night, there is an animation https://codepen.io/anon/pen/VXzgKO how to make this background (whose color is #1a1c1f) become transparent? Is it real?
ps. there is no need to offer to change to another color, I want to overlay this animation on top of the video.

Answer 1

maybe not everything is so simple, but I think you can use transparent

.wrapper {
    background: transparent;
    background-color: transparent;
    background-image: none;
}