<style>
.particles-js-canvas-el {
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: -1;
    top: 0;
    left:0;
}
</style>

<script src="https://cdn.jsdelivr.net/particles.js/2.0.0/particles.min.js"></script> 

<script>
//JS Code Here

</script>