Particles

<style>
.particles-js-canvas-el {
  position: absolute;
  max-width: 100%;
  max-height:100%;
  left: 0%;
  top: 0%;
  right: 0%;
  bottom: 0%;
  z-index: 0;
  }
 </style>
 
 <script src="https://cdn.jsdelivr.net/particles.js/2.0.0/particles.min.js"></script>
 
 <script>
 particlesJS(    
 // this is the ID your particles container needs to have "particles-js",    
 // Visit https://vincentgarreau.com/particles.js/ to get your code
 // Paste your code directly underneath this line
 )
 </script>