I just managed to do this with the next css code, just as the creator does in his nasa page:
body,
html {
height: 100%
}
#particles-js canvas {
display: block;
vertical-align: bottom;
-webkit-transform: scale(1);
-ms-transform: scale(1);
transform: scale(1);
opacity: 1;
-webkit-transition: opacity .8s ease, -webkit-transform 1.4s ease;
transition: opacity .8s ease, transform 1.4s ease
}
#particles-js {
width: 100%;
height: 100%;
position: fixed;
z-index: -10;
top: 0;
left: 0
}
Then I wrote
just after the body opening tag. Note that you can't see the canvas class because it's being generated by the particles.js library.
Canvas creation code fragment