<script src="https://cdnjs.cloudflare.com/ajax/libs/particlesjs/2.2.3/particles.min.js
"></script>
<script>
var section = document.getElementById('SECTION1');
var canv = document.createElement('canvas');
canv.setAttribute("class", "background");
section.appendChild(canv); 


window.onload = function() {
  Particles.init({
    selector: '.background',
    color: '#75A5B7',
    maxParticles: 130,
    connectParticles: true,
    responsive: [
      {
        breakpoint: 768,
        options: {
          maxParticles: 80
        }
      }, {
        breakpoint: 375,
        options: {
          maxParticles: 50
        }
      }
    ]
  });
};

</script>
<style>
.background {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  z-index: 0;
  width:100%;
  height:100%;
}
</style>