I got her template theme "Fox". You can see it here -> www.eylte.io

I have a question. I would like to have animated the background. I want that "Particle" to float around there. I have a particle.js for that. Just 

How can I adjust now that this is displayed in the background?

And I would like to apply exactly this thing in the complete background, where the night sky is. https://github.com/VincentGarreau/particles.js/

I do not know how I do that. I already edited the style.css ... this did not help. How do I get this animated background on the topic "Fox"?