Particles web Matrix effect

Hello, sorry for opening up an old thread. But i am having some issues with making the particles go fullscreen and merging with the other stuff in my page header. My site.

I added <div id="particles-js"></div> in the page header above my other text, but it is just positined above my other content, and not behind it fullscreen.

https://webec.no

Any idea what i am missing?

Thanks!

edit:
added this css and now its working!

#particles-js {
position:absolute;
width:100%;
height:100%;
}

Awesome :)