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HTML

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <nav class="main-nav">
  <i class="fa fa-circle" aria-label="Main"></i>
  <i class="fa fa-circle" aria-label="How It Works"></i>
  <i class="fa fa-circle" aria-hidden="Contact"></i>
</nav>

<div class="main-page page">
  <section class="main-page-content">
    <h1>big things</h1>
    <h2>an ode to the universe</h2>
  </section>
</div>

<div class="about-page page">
  <section class="about-page-content">
  </section>
</div>


<!-- THE UNIVERSE. Code adapted from https://codepen.io/Acuetouag/pen/vOgmza -->

<div class="universe">
  <div class="universe-container">
    <div class="content">
      <canvas id="universe"></canvas>
      <div id="footer">
        <svg id="scene" x="0px" y="0px" width="1600px" height="315px">
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!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Bungee+Hairline|Lato:300');
@import "compass/css3";

// Variables
$accent-1: #ed542c;
$main-font: "Bungee Hairline";
$sec-font: "Lato";

// CSS Reset

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

a {
  text-decoration: none;
}

html,
body {
  height: 100%;
  color: white;
}

// End reset

.main-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 40px;
  i {
    font-size: 8px;
    display: block;
    margin: 10px;
    transition: margin 200ms ease;
    &:hover {
      color: $accent-1;
    }
  }
  &:hover > i {
    margin: 15px 12px;
  } 
}

.page {
  height: 100%;
  background-color: transparent;
}

.main-page-content {
  background-color: transparent;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  
  h1 {
    font-family: $main-font;
    font-size: 60px;
  }

  h2 {
    font-family: $sec-font;
    font-size: 16px;
    letter-spacing: 2px;
  }
  
}



iframe {
  position: absolute;
  top: -100%;
}

// THE UNIVERSE. Code adapted from https://codepen.io/Acuetouag/pen/vOgmza

.universe {
  z-index: -10000;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  filter: contrast(120%);
  background-color: black;
  padding: 0px;
  margin: 0px;
  width: 100%;
  height: 100%;
}

.universe-container {
  width: 100%;
  height: 100%;
  background-image: radial-gradient(1600px at 70% 120%, rgba(33, 39, 80, 1) 10%, #020409 100%);
}

.content {
  width: inherit;
  height: inherit;
}

#universe {
  width: 100%;
  height: 100%;
}

#footer {
  position: absolute;
  bottom: 0px;
  height: 300px;
  width: 100%;
}

#scene {
  height: 100%;
  position: absolute;
  left: 50%;
  margin-left: -800px;
  z-index: 100000;
}
!

JS 

              
                // THE UNIVERSE. Code adapted from https://codepen.io/Acuetouag/pen/vOgmza

window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
  window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;

var starDensity = .216;
var speedCoeff = .05;
var width;
var height;
var starCount;
var circleRadius;
var circleCenter;
var first = true;
var giantColor = '180,184,240';
var starColor = '226,225,142';
var cometColor = '226,225,224';
var canva = document.getElementById('universe');
var stars = [];

windowResizeHandler();
window.addEventListener('resize', windowResizeHandler, false);

createUniverse();

function createUniverse() {
  universe = canva.getContext('2d');

  for (var i = 0; i < starCount; i++) {
    stars[i] = new Star();
    stars[i].reset();
  }

  draw();
}

function draw() {
  universe.clearRect(0, 0, width, height);

  var starsLength = stars.length;

  for (var i = 0; i < starsLength; i++) {
    var star = stars[i];
    star.move();
    star.fadeIn();
    star.fadeOut();
    star.draw();
  }

  window.requestAnimationFrame(draw);
}

function Star() {

  this.reset = function() {
    this.giant = getProbability(3);
    this.comet = this.giant || first ? false : getProbability(10);
    this.x = getRandInterval(0, width - 10);
    this.y = getRandInterval(0, height);
    this.r = getRandInterval(1.1, 2.6);
    this.dx = getRandInterval(speedCoeff, 6 * speedCoeff) + (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120) + speedCoeff * 2;
    this.dy = -getRandInterval(speedCoeff, 6 * speedCoeff) - (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120);
    this.fadingOut = null;
    this.fadingIn = true;
    this.opacity = 0;
    this.opacityTresh = getRandInterval(.2, 1 - (this.comet + 1 - 1) * .4);
    this.do = getRandInterval(0.0005, 0.002) + (this.comet + 1 - 1) * .001;
  };

  this.fadeIn = function() {
    if (this.fadingIn) {
      this.fadingIn = this.opacity > this.opacityTresh ? false : true;
      this.opacity += this.do;
    }
  };

  this.fadeOut = function() {
    if (this.fadingOut) {
      this.fadingOut = this.opacity < 0 ? false : true;
      this.opacity -= this.do / 2;
      if (this.x > width || this.y < 0) {
        this.fadingOut = false;
        this.reset();
      }
    }
  };

  this.draw = function() {
    universe.beginPath();

    if (this.giant) {
      universe.fillStyle = 'rgba(' + giantColor + ',' + this.opacity + ')';
      universe.arc(this.x, this.y, 2, 0, 2 * Math.PI, false);
    } else if (this.comet) {
      universe.fillStyle = 'rgba(' + cometColor + ',' + this.opacity + ')';
      universe.arc(this.x, this.y, 1.5, 0, 2 * Math.PI, false);

      //comet tail
      for (var i = 0; i < 30; i++) {
        universe.fillStyle = 'rgba(' + cometColor + ',' + (this.opacity - (this.opacity / 20) * i) + ')';
        universe.rect(this.x - this.dx / 4 * i, this.y - this.dy / 4 * i - 2, 2, 2);
        universe.fill();
      }
    } else {
      universe.fillStyle = 'rgba(' + starColor + ',' + this.opacity + ')';
      universe.rect(this.x, this.y, this.r, this.r);
    }

    universe.closePath();
    universe.fill();
  };

  this.move = function() {
    this.x += this.dx;
    this.y += this.dy;
    if (this.fadingOut === false) {
      this.reset();
    }
    if (this.x > width - (width / 4) || this.y < 0) {
      this.fadingOut = true;
    }
  };

  (function() {
    setTimeout(function() {
      first = false;
    }, 50)
  })()
}

function getProbability(percents) {
  return ((Math.floor(Math.random() * 1000) + 1) < percents * 10);
}

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

function windowResizeHandler() {
  width = window.innerWidth;
  height = window.innerHeight;
  starCount = width * starDensity;
  circleRadius = (width > height ? height / 2 : width / 2);
  circleCenter = {
    x: width / 2,
    y: height / 2
  }

  canva.setAttribute('width', width);
  canva.setAttribute('height', height);
}
!
999px

Console