To make your website more beautiful, you can use items that make your website different from other websites. In this code, we have prepared one of these items for you. We have an attractive and moving background that particles are connected by the movement of the mouse and form shapes like constellations. The background of these particles is a picture of a galaxy, and the presence of particles on this picture makes this background look more natural.


HTML
<!-- This script got from www.devanswer.com  -->
<link href='https://fonts.googleapis.com/css?family=Raleway:200,400,800' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel='stylesheet' href='http://devanswer.com/codes/files/demo.css'>
<script src='http://devanswer.com/codes/files/EasePack.min.js'></script>
<script src='http://devanswer.com/codes/files/rAF.js'></script>
<script src='http://devanswer.com/codes/files/TweenLite.min.js'></script>
<div id="large-header" class="large-header">
    <canvas id="demo-canvas"></canvas>
    <h1 class="main-title">Connect <span class="thin">Three</span></h1>
</div>
<div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com ">Developers Answer</a></div>
                        

CSS
/* Header */
.large-header {
  position: relative;
  width: 100%;
  background: #333;
  overflow: hidden;
  background-size: cover;
  background-position: center center;
  z-index: 1;
}
#large-header {
  background-image: url("http://devanswer.com/img/demo-1-bg.jpg");
}
.main-title {
  position: absolute;
  margin: 0;
  padding: 0;
  color: #f9f1e9;
  text-align: center;
  top: 50%;
  left: 50%;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}
.demo-1 .main-title {
  text-transform: uppercase;
  font-size: 4.2em;
  letter-spacing: 0.1em;
}
.main-title .thin {
  font-weight: 200;
}
@media only screen and (max-width: 768px) {
  .demo-1 .main-title {
    font-size: 3em;
  }
}
Javascript
(function () {
var width, height, largeHeader, canvas, ctx, points, target, animateHeader = true;
// Main
initHeader();
initAnimation();
addListeners();
function initHeader() {
    width = window.innerWidth;
    height = window.innerHeight;
    target = { x: width / 2, y: height / 2 };
    largeHeader = document.getElementById('large-header');
    largeHeader.style.height = height + 'px';
    canvas = document.getElementById('demo-canvas');
    canvas.width = width;
    canvas.height = height;
    ctx = canvas.getContext('2d');
    // create points
    points = [];
    for (var x = 0; x < width; x = x + width / 20) {
        for (var y = 0; y < height; y = y + height / 20) {
            var px = x + Math.random() * width / 20;
            var py = y + Math.random() * height / 20;
            var p = { x: px, originX: px, y: py, originY: py };
            points.push(p);
        }
    }
    // for each point find the 5 closest points
    for (var i = 0; i < points.length; i++) {
        var closest = [];
        var p1 = points[i];
        for (var j = 0; j < points.length; j++) {
            var p2 = points[j]
            if (!(p1 == p2)) {
                var placed = false;
                for (var k = 0; k < 5; k++) {
                    if (!placed) {
                        if (closest[k] == undefined) {
                            closest[k] = p2;
                            placed = true;
                        }
                    }
                }
                for (var k = 0; k < 5; k++) {
                    if (!placed) {
                        if (getDistance(p1, p2) < getDistance(p1, closest[k])) {
                            closest[k] = p2;
                            placed = true;
                        }
                    }
                }
            }
        }
        p1.closest = closest;
    }
    // assign a circle to each point
    for (var i in points) {
        var c = new Circle(points[i], 2 + Math.random() * 2, 'rgba(255,255,255,0.3)');
        points[i].circle = c;
    }
}
// Event handling
function addListeners() {
    if (!('ontouchstart' in window)) {
        window.addEventListener('mousemove', mouseMove);
    }
    window.addEventListener('scroll', scrollCheck);
    window.addEventListener('resize', resize);
}
function mouseMove(e) {
    var posx = posy = 0;
    if (e.pageX || e.pageY) {
        posx = e.pageX;
        posy = e.pageY;
    }
    else if (e.clientX || e.clientY) {
        posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
        posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
    }
    target.x = posx;
    target.y = posy;
}
function scrollCheck() {
    if (document.body.scrollTop > height) animateHeader = false;
    else animateHeader = true;
}
function resize() {
    width = window.innerWidth;
    height = window.innerHeight;
    largeHeader.style.height = height + 'px';
    canvas.width = width;
    canvas.height = height;
}
// animation
function initAnimation() {
    animate();
    for (var i in points) {
        shiftPoint(points[i]);
    }
}
function animate() {
    if (animateHeader) {
        ctx.clearRect(0, 0, width, height);
        for (var i in points) {
            // detect points in range
            if (Math.abs(getDistance(target, points[i])) < 4000) {
                points[i].active = 0.3;
                points[i].circle.active = 0.6;
            } else if (Math.abs(getDistance(target, points[i])) < 20000) {
                points[i].active = 0.1;
                points[i].circle.active = 0.3;
            } else if (Math.abs(getDistance(target, points[i])) < 40000) {
                points[i].active = 0.02;
                points[i].circle.active = 0.1;
            } else {
                points[i].active = 0;
                points[i].circle.active = 0;
            }
            drawLines(points[i]);
            points[i].circle.draw();
        }
    }
    requestAnimationFrame(animate);
}
function shiftPoint(p) {
    TweenLite.to(p, 1 + 1 * Math.random(), {
        x: p.originX - 50 + Math.random() * 100,
        y: p.originY - 50 + Math.random() * 100, ease: Circ.easeInOut,
        onComplete: function () {
            shiftPoint(p);
        }
    });
}
// Canvas manipulation
function drawLines(p) {
    if (!p.active) return;
    for (var i in p.closest) {
        ctx.beginPath();
        ctx.moveTo(p.x, p.y);
        ctx.lineTo(p.closest[i].x, p.closest[i].y);
        ctx.strokeStyle = 'rgba(156,217,249,' + p.active + ')';
        ctx.stroke();
    }
}
function Circle(pos, rad, color) {
    var _this = this;
    // constructor
    (function () {
        _this.pos = pos || null;
        _this.radius = rad || null;
        _this.color = color || null;
    })();
    this.draw = function () {
        if (!_this.active) return;
        ctx.beginPath();
        ctx.arc(_this.pos.x, _this.pos.y, _this.radius, 0, 2 * Math.PI, false);
        ctx.fillStyle = 'rgba(156,217,249,' + _this.active + ')';
        ctx.fill();
    };
}
// Util
function getDistance(p1, p2) {
    return Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2);
}
})();