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"use strict";"object"!=typeof window.CP&&(window.CP={}),window.CP.PenTimer={programNoLongerBeingMonitored:!1,timeOfFirstCallToShouldStopLoop:0,_loopExits:{},_loopTimers:{},START_MONITORING_AFTER:2e3,STOP_ALL_MONITORING_TIMEOUT:5e3,MAX_TIME_IN_LOOP_WO_EXIT:2200,exitedLoop:function(o){this._loopExits[o]=!0},shouldStopLoop:function(o){if(this.programKilledSoStopMonitoring)return!0;if(this.programNoLongerBeingMonitored)return!1;if(this._loopExits[o])return!1;var t=this._getTime();if(0===this.timeOfFirstCallToShouldStopLoop)return this.timeOfFirstCallToShouldStopLoop=t,!1;var i=t-this.timeOfFirstCallToShouldStopLoop;if(i<this.START_MONITORING_AFTER)return!1;if(i>this.STOP_ALL_MONITORING_TIMEOUT)return this.programNoLongerBeingMonitored=!0,!1;try{this._checkOnInfiniteLoop(o,t)}catch(o){return this._sendErrorMessageToEditor(),this.programKilledSoStopMonitoring=!0,!0}return!1},_sendErrorMessageToEditor:function(){try{if(this._shouldPostMessage()){var o={action:"infinite-loop",line:this._findAroundLineNumber()};parent.postMessage(JSON.stringify(o),"*")}else this._throwAnErrorToStopPen()}catch(o){this._throwAnErrorToStopPen()}},_shouldPostMessage:function(){return document.location.href.match(/boomerang/)},_throwAnErrorToStopPen:function(){throw"We found an infinite loop in your Pen. We've stopped the Pen from running. Please correct it or contact support@codepen.io."},_findAroundLineNumber:function(){var o=new Error,t=0;if(o.stack){var i=o.stack.match(/boomerang\S+:(\d+):\d+/);i&&(t=i[1])}return t},_checkOnInfiniteLoop:function(o,t){if(!this._loopTimers[o])return this._loopTimers[o]=t,!1;var i=t-this._loopTimers[o];if(i>this.MAX_TIME_IN_LOOP_WO_EXIT)throw"Infinite Loop found on loop: "+o},_getTime:function(){return+new Date}},window.CP.shouldStopExecution=function(o){var t=window.CP.PenTimer.shouldStopLoop(o);return t===!0&&console.warn("[CodePen]: An infinite loop (or a loop taking too long) was detected, so we stopped its execution. Sorry!"),t},window.CP.exitedLoop=function(o){window.CP.PenTimer.exitedLoop(o)};

Music is by The XX
  @see http://thexx.info

This is best viewed in Chrome since there is a bug in Safari
  when using getByteFrequencyData with MediaElementAudioSource

@see https://goo.gl/6WLx1
 */

(function() {
  var ALPHA, AudioAnalyser, COLORS, MP3_PATH, NUM_BANDS, NUM_PARTICLES, Particle, SCALE, SIZE, SMOOTHING, SPEED, SPIN;

NUM_PARTICLES = 150;

NUM_BANDS = 128;

SMOOTHING = 0.5;

MP3_PATH = 'https://api.soundcloud.com/tracks/42328219/stream?client_id=b1495e39071bd7081a74093816f77ddb';

SCALE = {
    MIN: 5.0,
    MAX: 80.0
  };

SPEED = {
    MIN: 0.2,
    MAX: 1.0
  };

ALPHA = {
    MIN: 0.8,
    MAX: 0.9
  };

SPIN = {
    MIN: 0.001,
    MAX: 0.005
  };

SIZE = {
    MIN: 0.5,
    MAX: 1.25
  };

COLORS = ['#69D2E7', '#1B676B', '#BEF202', '#EBE54D', '#00CDAC', '#1693A5', '#F9D423', '#FF4E50', '#E7204E', '#0CCABA', '#FF006F'];

AudioAnalyser = (function() {
    AudioAnalyser.AudioContext = self.AudioContext || self.webkitAudioContext;

AudioAnalyser.enabled = AudioAnalyser.AudioContext != null;

AudioAnalyser.prototype.start = function() {
      return this.audio.play();
    };

AudioAnalyser.prototype.stop = function() {
      return this.audio.pause();
    };

return AudioAnalyser;

})();

Particle = (function() {
    function Particle(x1, y1) {
      this.x = x1 != null ? x1 : 0;
      this.y = y1 != null ? y1 : 0;
      this.reset();
    }

Particle.prototype.reset = function() {
      this.level = 1 + floor(random(4));
      this.scale = random(SCALE.MIN, SCALE.MAX);
      this.alpha = random(ALPHA.MIN, ALPHA.MAX);
      this.speed = random(SPEED.MIN, SPEED.MAX);
      this.color = random(COLORS);
      this.size = random(SIZE.MIN, SIZE.MAX);
      this.spin = random(SPIN.MAX, SPIN.MAX);
      this.band = floor(random(NUM_BANDS));
      if (random() < 0.5) {
        this.spin = -this.spin;
      }
      this.smoothedScale = 0.0;
      this.smoothedAlpha = 0.0;
      this.decayScale = 0.0;
      this.decayAlpha = 0.0;
      this.rotation = random(TWO_PI);
      return this.energy = 0.0;
    };

Particle.prototype.move = function() {
      this.rotation += this.spin;
      return this.y -= this.speed * this.level;
    };

Particle.prototype.draw = function(ctx) {
      var alpha, power, scale;
      power = exp(this.energy);
      scale = this.scale * power;
      alpha = this.alpha * this.energy * 1.5;
      this.decayScale = max(this.decayScale, scale);
      this.decayAlpha = max(this.decayAlpha, alpha);
      this.smoothedScale += (this.decayScale - this.smoothedScale) * 0.3;
      this.smoothedAlpha += (this.decayAlpha - this.smoothedAlpha) * 0.3;
      this.decayScale *= 0.985;
      this.decayAlpha *= 0.975;
      ctx.save();
      ctx.beginPath();
      ctx.translate(this.x + cos(this.rotation * this.speed) * 250, this.y);
      ctx.rotate(this.rotation);
      ctx.scale(this.smoothedScale * this.level, this.smoothedScale * this.level);
      ctx.moveTo(this.size * 0.5, 0);
      ctx.lineTo(this.size * -0.5, 0);
      ctx.lineWidth = 1;
      ctx.lineCap = 'round';
      ctx.globalAlpha = this.smoothedAlpha / this.level;
      ctx.strokeStyle = this.color;
      ctx.stroke();
      return ctx.restore();
    };

return Particle;

})();

Sketch.create({
    particles: [],
    setup: function() {
      var analyser, error, i, intro, j, particle, ref, warning, x, y;
      for (i = j = 0, ref = NUM_PARTICLES - 1; j <= ref; i = j += 1) {if (window.CP.shouldStopExecution(1)){break;}
        x = random(this.width);
        y = random(this.height * 2);
        particle = new Particle(x, y);
        particle.energy = random(particle.band / 256);
        this.particles.push(particle);
      }
window.CP.exitedLoop(1);

if (AudioAnalyser.enabled) {
        try {
          analyser = new AudioAnalyser(MP3_PATH, NUM_BANDS, SMOOTHING);
          analyser.onUpdate = (function(_this) {
            return function(bands) {
              var k, len, ref1, results;
              ref1 = _this.particles;
              results = [];
              for (k = 0, len = ref1.length; k < len; k++) {if (window.CP.shouldStopExecution(2)){break;}
                particle = ref1[k];
                results.push(particle.energy = bands[particle.band] / 256);
              }
window.CP.exitedLoop(2);

return results;
            };
          })(this);
          analyser.start();
          document.body.appendChild(analyser.audio);
          intro = document.getElementById('intro');
          intro.style.display = 'none';
          if (/Safari/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent)) {
            warning = document.getElementById('warning2');
            return warning.style.display = 'block';
          }
        } catch (error1) {
          error = error1;
        }
      } else {
        warning = document.getElementById('warning1');
        return warning.style.display = 'block';
      }
    },
    draw: function() {
      var j, len, particle, ref, results;
      this.globalCompositeOperation = 'lighter';
      ref = this.particles;
      results = [];
      for (j = 0, len = ref.length; j < len; j++) {if (window.CP.shouldStopExecution(3)){break;}
        particle = ref[j];
        if (particle.y < -particle.size * particle.level * particle.scale * 2) {
          particle.reset();
          particle.x = random(this.width);
          particle.y = this.height + particle.size * particle.scale * particle.level;
        }
        particle.move();
        results.push(particle.draw(this));
      }
window.CP.exitedLoop(3);

return results;
    }
  });

}).call(this);

CSS

@import url(https://fonts.googleapis.com/css?family=Lato:400,700);
html, body {
  font-family: "Lato", sans-serif;
  background: #13242f;
  overflow: hidden;
}

#container:before {
  background-image: url('data:image/svg+xml;base64,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');
  background-size: 100%;
  background-image: -moz-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0) 20%, #000000 95%);
  background-image: -webkit-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0) 20%, #000000 95%);
  background-image: radial-gradient(ellipse cover at center, rgba(0, 0, 0, 0) 20%, #000000 95%);
  position: absolute;
  content: "";
  z-index: 0;
  opacity: 0.9;
  height: 100%;
  width: 100%;
  left: 0;
  top: 0;
}
#container:after {
  background: url("https://s.cdpn.io/1715/noise-1.png");
  position: absolute;
  content: "";
  z-index: 1;
  opacity: 0.8;
  height: 100%;
  width: 100%;
  left: 0;
  top: 0;
}

audio {
  position: absolute;
  z-index: 2;
  right: 0;
  top: 0;
}

.message {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  text-transform: uppercase;
  border-radius: 3px;
  text-align: center;
  line-height: 1.2;
  background: rgba(0, 0, 0, 0.8);
  position: absolute;
  margin-left: -180px;
  margin-top: -30px;
  font-size: 13px;
  padding: 20px;
  display: none;
  z-index: 3;
  height: 60px;
  width: 360px;
  color: #fff;
  left: 50%;
  top: 50%;
}
.message h1, .message h2 {
  font-weight: 300;
  margin: 10px 0;
}
.message h1 a, .message h2 a {
  text-decoration: none;
  font-weight: 700;
  color: #1B676B;
}

#intro {
  display: block;
}

HTML

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