text: var cfg = {
  	particles: {
  		number: {value: 20, density: {enable: true, value_area: 1E3}},
  		color: {value: "#e1e1e1"},
  		shape: {
  			type: "circle",
  			stroke: {width: 0, color: "#000000"},
  			polygon: {nb_sides: 5},
  			image: {src: "img/github.svg", width: 100, height: 100}
  		},
  		opacity: {value: .5, random: false, anim: {enable: false, speed: 1, opacity_min: .1, sync: false}},
  		size: {
  			value: 15, random: true, anim: {
  				enable: false,
  				speed: 180, size_min: .1, sync: false
  			}
  		},
  		line_linked: {enable: true, distance: 650, color: "#cfcfcf", opacity: .26, width: 1},
  		move: {
  			enable: true,
  			speed: 2,
  			direction: "none",
  			random: true,
  			straight: false,
  			out_mode: "out",
  			bounce: false,
  			attract: {enable: false, rotateX: 600, rotateY: 1200}
  		}
  	}, interactivity: {
  		detect_on: "canvas",
  		events: {onhover: {enable: false, mode: "repulse"}, onclick: {enable: false, 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: 200, duration: .4},
  			push: {particles_nb: 4},
  			remove: {particles_nb: 2}
  		}
  	}, retina_detect: true
  };
  particlesJS("particles-js", cfg);
  var update = function() {
  	requestAnimationFrame(update);
  };
  requestAnimationFrame(update);