Particles over background image : <p>As seen on <a href="https://discordapp.com/" rel="nofollow">https://discordapp.com/</a> there's floating particles overlaying the background of the header. I've searched pretty much everywhere, trying to export transparent videos, gifs from Premiere CC, After Effects even Photoshop, but none of them will work as seen on this page. 
I have also not been able to read through the code to find the source of the effect.</p>
