How do I add a Animated Background?

Site URL: https://helix-llama-b98e.squarespace.com/

I was looking into this codepen and would like to add it to the whole page https://codepen.io/dhamopatel/pen/xJPVWm, I modified the code a little to remove the log in stuff and just look at the background so just the following code bellow was used. I tried to inject it into the page but it did not work. I also tried a code block and was unable to get it to work. Can anyone help

<div id="particles-js"></div>
<style>
  body, html {
	height: 100%;
	background-repeat: no-repeat;    /*background-image: linear-gradient(rgb(12, 97, 33),rgb(104, 145, 162));*/
	background:black;
	position: relative;
  }
  #particles-js{
      width: 100%;
      height: 100%;
      background-size: cover;
      background-position: 50% 50%;
      position: fixed;
      top: 0px;
      z-index:1;
  }
</style>
<script>
  $.getScript("https://cdnjs.cloudflare.com/ajax/libs/particles.js/2.0.0/particles.min.js", function(){
    particlesJS('particles-js',
      {
        "particles": {
          "number": {
            "value": 100,
            "density": {
              "enable": true,
              "value_area": 500
            }
          },
          "color": {
            "value": "#b1c900"
          },
          "shape": {
            "type": "circle",
            "stroke": {
              "width": 0,
              "color": "#000000"
            },
            "polygon": {
              "nb_sides": 5
            },
            "image": {
              "width": 100,
              "height": 100
            }
          },
          "opacity": {
            "value": 0.5,
            "random": false,
            "anim": {
              "enable": false,
              "speed": 1,
              "opacity_min": 0.1,
              "sync": false
            }
          },
          "size": {
            "value": 5,
            "random": true,
            "anim": {
              "enable": false,
              "speed": 40,
              "size_min": 0.1,
              "sync": false
            }
          },
          "line_linked": {
            "enable": true,
            "distance": 150,
            "color": "#ffffff",
            "opacity": 0.4,
            "width": 1
          },
          "move": {
            "enable": true,
            "speed": 6,
            "direction": "none",
            "random": false,
            "straight": false,
            "out_mode": "out",
            "attract": {
              "enable": false,
              "rotateX": 600,
              "rotateY": 1200
            }
          }
        },
        "interactivity": {
          "detect_on": "canvas",
          "events": {
            "onhover": {
              "enable": true,
              "mode": "repulse"
            },
            "onclick": {
              "enable": true,
              "mode": "push"
            },
            "resize": true
          },
          "modes": {
            "grab": {
              "distance": 400,
              "line_linked": {
                "opacity": 1
              }
            },
            "bubble": {
              "distance": 400,
              "size": 40,
              "duration": 2,
              "opacity": 8,
              "speed": 3
            },
            "repulse": {
              "distance": 100
            },
            "push": {
              "particles_nb": 4
            },
            "remove": {
              "particles_nb": 2
            }
          }
        },
        "retina_detect": true,
        "config_demo": {
          "hide_card": false,
          "background_color": "#b61924",
          "background_image": "",
          "background_position": "50% 50%",
          "background_repeat": "no-repeat",
          "background_size": "cover"
        }
      }
    );

});
</script>