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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <body class="thunder">
  <canvas id="canvas1"></canvas>
  <canvas id="canvas2"></canvas>
  <canvas id="canvas3"></canvas>
</body>
              
            
!

CSS

              
                @mixin size($size) {
  width: $size;
  height: $size;
}

@mixin abs-pos {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

html,
body,
canvas {
  @include size(100%);
}

body {
  @include size(100%);
  background-color: #222;
  background-image: url('https://drive.google.com/uc?export=view&id=0BzFF7FmbJUo5X0NEUXFVd0NBcWc');
  background-size: cover;
  background-position: 0 0;
  background-repeat: no-repeat;
  position: relative;
  z-index: 0;
  &:after {
    content: '';
    @include size(100%);
    @include abs-pos;
    background-color: rgba(0, 0, 0, 0.1);
    z-index: 1;
    animation: thunder-bg 6s infinite;
  }
}

canvas {
  @include abs-pos;
}

#canvas3 {
  z-index: 5;
}

#canvas2 {
  z-index: 10;
}

#canvas1 {
  z-index: 100;
}

$color1: rgba(34,
34,
34,
.9);
$color2: rgba(59,
59,
59,
.3);
.thunder {
  @at-root {
    @-webkit-keyframes thunder-bg {
      0% {
        background-color: $color1;
      }
      9% {
        background-color: $color1;
      }
      10% {
        background-color: $color2;
      }
      10.5% {
        background-color: $color1;
      }
      80% {
        background-color: $color1;
      }
      82% {
        background-color: $color2;
      }
      83% {
        background-color: $color1;
      }
      83.5% {
        background-color: $color2;
      }
      100% {
        background-color: $color1;
      }
    }
  }
}
              
            
!

JS

              
                var canvas1 = document.getElementById('canvas1');
var canvas2 = document.getElementById('canvas2');
var canvas3 = document.getElementById('canvas3');
var ctx1 = canvas1.getContext('2d');
var ctx2 = canvas2.getContext('2d');
var ctx3 = canvas3.getContext('2d');

var rainthroughnum = 500;
var speedRainTrough = 25;
var RainTrough = [];

var rainnum = 500;
var rain = [];

var lightning = [];
var lightTimeCurrent = 0;
var lightTimeTotal = 0;

var w = canvas1.width = canvas2.width = canvas3.width = window.innerWidth;
var h = canvas1.height = canvas2.height = canvas3.height = window.innerHeight;
window.addEventListener('resize', function() {
  w = canvas1.width = canvas2.width = canvas3.width = window.innerWidth;
  h = canvas1.height = canvas2.height = canvas3.height = window.innerHeight;
});

function random(min, max) {
  return Math.random() * (max - min + 1) + min;
}

function clearcanvas1() {
  ctx1.clearRect(0, 0, w, h);
}

function clearcanvas2() {
  ctx2.clearRect(0, 0, canvas2.width, canvas2.height);
}

function clearCanvas3() {
  ctx3.globalCompositeOperation = 'destination-out';
  ctx3.fillStyle = 'rgba(0,0,0,' + random(1, 30) / 100 + ')';
  ctx3.fillRect(0, 0, w, h);
  ctx3.globalCompositeOperation = 'source-over';
};

function createRainTrough() {
  for (var i = 0; i < rainthroughnum; i++) {
    RainTrough[i] = {
      x: random(0, w),
      y: random(0, h),
      length: Math.floor(random(1, 830)),
      opacity: Math.random() * 0.2,
      xs: random(-2, 2),
      ys: random(10, 20)
    };
  }
}

function createRain() {
  for (var i = 0; i < rainnum; i++) {
    rain[i] = {
      x: Math.random() * w,
      y: Math.random() * h,
      l: Math.random() * 1,
      xs: -4 + Math.random() * 4 + 2,
      ys: Math.random() * 10 + 10
    };
  }
}

function createLightning() {
  var x = random(100, w - 100);
  var y = random(0, h / 4);

  var createCount = random(1, 3);
  for (var i = 0; i < createCount; i++) {
    single = {
      x: x,
      y: y,
      xRange: random(5, 30),
      yRange: random(10, 25),
      path: [{
        x: x,
        y: y
      }],
      pathLimit: random(40, 55)
    };
    lightning.push(single);
  }
};

function drawRainTrough(i) {
  ctx1.beginPath();
  var grd = ctx1.createLinearGradient(0, RainTrough[i].y, 0, RainTrough[i].y + RainTrough[i].length);
  grd.addColorStop(0, "rgba(255,255,255,0)");
  grd.addColorStop(1, "rgba(255,255,255," + RainTrough[i].opacity + ")");

  ctx1.fillStyle = grd;
  ctx1.fillRect(RainTrough[i].x, RainTrough[i].y, 1, RainTrough[i].length);
  ctx1.fill();
}

function drawRain(i) {
  ctx2.beginPath();
  ctx2.moveTo(rain[i].x, rain[i].y);
  ctx2.lineTo(rain[i].x + rain[i].l * rain[i].xs, rain[i].y + rain[i].l * rain[i].ys);
  ctx2.strokeStyle = 'rgba(174,194,224,0.5)';
  ctx2.lineWidth = 1;
  ctx2.lineCap = 'round';
  ctx2.stroke();
}

function drawLightning() {
  for (var i = 0; i < lightning.length; i++) {
    var light = lightning[i];

    light.path.push({
      x: light.path[light.path.length - 1].x + (random(0, light.xRange) - (light.xRange / 2)),
      y: light.path[light.path.length - 1].y + (random(0, light.yRange))
    });

    if (light.path.length > light.pathLimit) {
      lightning.splice(i, 1);
    }

    ctx3.strokeStyle = 'rgba(255, 255, 255, .1)';
    ctx3.lineWidth = 3;
    if (random(0, 15) === 0) {
      ctx3.lineWidth = 6;
    }
    if (random(0, 30) === 0) {
      ctx3.lineWidth = 8;
    }

    ctx3.beginPath();
    ctx3.moveTo(light.x, light.y);
    for (var pc = 0; pc < light.path.length; pc++) {
      ctx3.lineTo(light.path[pc].x, light.path[pc].y);
    }
    if (Math.floor(random(0, 30)) === 1) { //to fos apo piso
      ctx3.fillStyle = 'rgba(255, 255, 255, ' + random(1, 3) / 100 + ')';
      ctx3.fillRect(0, 0, w, h);
    }
    ctx3.lineJoin = 'miter';
    ctx3.stroke();
  }
};

function animateRainTrough() {
  clearcanvas1();
  for (var i = 0; i < rainthroughnum; i++) {
    if (RainTrough[i].y >= h) {
      RainTrough[i].y = h - RainTrough[i].y - RainTrough[i].length * 5;
    } else {
      RainTrough[i].y += speedRainTrough;
    }
    drawRainTrough(i);
  }
}

function animateRain() {
  clearcanvas2();
  for (var i = 0; i < rainnum; i++) {
    rain[i].x += rain[i].xs;
    rain[i].y += rain[i].ys;
    if (rain[i].x > w || rain[i].y > h) {
      rain[i].x = Math.random() * w;
      rain[i].y = -20;
    }
    drawRain(i);
  }
}

function animateLightning() {
  clearCanvas3();
  lightTimeCurrent++;
  if (lightTimeCurrent >= lightTimeTotal) {
    createLightning();
    lightTimeCurrent = 0;
    lightTimeTotal = 200;  //rand(100, 200)
  }
  drawLightning();
}

function init() {
  createRainTrough();
  createRain();
  window.addEventListener('resize', createRainTrough);
}
init();

function animloop() {
  animateRainTrough();
  animateRain();
  animateLightning();
  requestAnimationFrame(animloop);
}
animloop();
              
            
!
999px

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