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Adding Classes

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About the <head>

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Insecure Resource

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">

<div id="wrapper">
<header class="mobile-only" id="mobile-header">
  <button id="open-nav" class="mobile-only">
      <i class="fa fa-bars"></i>
  </button>
  <span class="site-title">Frederik Creemers</span>
</header>
<nav id="nav">
  <button class="fr mobile-only" id="close-nav">
    <i class="fa fa-times"></i>
  </button>
  <div class="site-title">
    Frederik Creemers
    <img class="round" src="https://www.gravatar.com/avatar/5e4575fdaacc879dc2199490417d170a?s=200">
  </div>
  <ul id="menu">
    <li>
      <a href="/">
        Home<i class="fa fa-home"></i>
      </a>
    </li>
    <li>
      <a href="/blog">
        Blog<i class="fa fa-rss"></i>
      </a>
    </li>
    <li>
      <a href="/about">
        About<i class="fa fa-user"></i>
      </a>
    </li>
    <li>
      <a href="https://github.com/bigblind">
        Github<i class="fa fa-github"></i>
      </a>
    </li>
    <li>
      <a href="https://twitter.com/_bigblind">
        Twitter<i class="fa fa-twitter"></i>
      </a>
    </li>
  </ul>
</nav>
<section id="main">
  <h1 class="page-title">
    Page title
  </h1>
  <section>
    <h1>A blog post about tech</h1>
    <span class="postdate"><i class="fa fa-calendar" aria-hidden></i> February 2nd, 2017</span>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. An vero, inquit, quisquam potest probare, quod perceptfum, quod. Haec quo modo conveniant, non sane intellego. Aliter enim explicari, quod quaeritur, non potest. Sed quid sentiat, non videtis. Duo Reges: constructio interrete. At, illa, ut vobis placet, partem quandam tuetur, reliquam deserit. Legimus tamen Diogenem, Antipatrum, Mnesarchum, Panaetium, multos alios in primisque familiarem nostrum Posidonium. Quae hic rei publicae vulnera inponebat, eadem ille sanabat. Semper enim ita adsumit aliquid, ut ea, quae prima dederit, non deserat. </p>

<p>Et quod est munus, quod opus sapientiae? Quantum Aristoxeni ingenium consumptum videmus in musicis? Sed plane dicit quod intellegit. Quod vestri non item. Dicet pro me ipsa virtus nec dubitabit isti vestro beato M. Quod idem cum vestri faciant, non satis magnam tribuunt inventoribus gratiam. </p>

<p>Ut in voluptate sit, qui epuletur, in dolore, qui torqueatur. An hoc usque quaque, aliter in vita? Tu autem negas fortem esse quemquam posse, qui dolorem malum putet. Ut pulsi recurrant? Piso igitur hoc modo, vir optimus tuique, ut scis, amantissimus. Ergo id est convenienter naturae vivere, a natura discedere. Portenta haec esse dicit, neque ea ratione ullo modo posse vivi; Roges enim Aristonem, bonane ei videantur haec: vacuitas doloris, divitiae, valitudo; </p>

<p>Non dolere, inquam, istud quam vim habeat postea videro; Mihi, inquam, qui te id ipsum rogavi? Et non ex maxima parte de tota iudicabis? Sed ne, dum huic obsequor, vobis molestus sim. Esse enim quam vellet iniquus iustus poterat inpune. </p>
<p><img src="https://thepracticaldev.s3.amazonaws.com/i/ket4231nz0m9ma8kogyf.gif" alt="The illustration shows 3 rectangles representing computer screens. One represents the option to move the screen image &quot;continuously with the pointer&quot;. In this mode, the screen moves as soon as the mouse moves. The position of the mouse on the magnified piece of the screen is proportional to the position of the mouse on the full-sized screen. In the &quot;keep pointer centered&quot; mode, the mouse stays centered as long as it is far away enough from the edge. When near the edge, the magnified image stops moving, so the pointer can move away from the center, towards the edge. In the &quot;only move on edges&quot; mode, the magnified portion of the screen doesn't move until the pointer hits one of the edges of the magnified area." /></p>
<p>Si autem id non concedatur, non continuo vita beata tollitur. Non est ista, inquam, Piso, magna dissensio. Bona autem corporis huic sunt, quod posterius posui, similiora. Negat esse eam, inquit, propter se expetendam. Ille vero, si insipiens-quo certe, quoniam tyrannus -, numquam beatus; Non quaeritur autem quid naturae tuae consentaneum sit, sed quid disciplinae. Mihi, inquam, qui te id ipsum rogavi? Potius inflammat, ut coercendi magis quam dedocendi esse videantur. </p>


  </section>
</section>
<section id="footer">
  &copy; 2017 Frederik Creemers
</section>
</div>
!

CSS 

              
                html {
  background-color:red;
  margin:0;
  padding:0;
  font-size: 1rem;
  position:relative;
  width: 100%;
  height: 100%;
  min-height: 10rem;
}

*, *:before, *:after {
  box-sizing: border-box;
}

body {
  font-family: "Roboto Slab", "DroidSerif", Cambria, Georgia, "Times New Roman", Times, serif;
  font-style:normal;
  position:fixed;
  left:0;
  right:0;
  top:0;
  bottom:0;
  margin: 0;
  padding: 0;
  background-color: white;
}

#wrapper {
  display: flex;
  flex-direction:row;
  align-items: stretch;
  flex-wrap: wrap;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: 0;
  padding: 0;
  overflow: auto;
}

#mobile-header{
  width: 100%;
  background-color: #3c0000;
  color:white;
  vertical-align: middle;
  padding-left:1rem;
}

#mobile-header button, nav button{
  background-color: transparent;
  font-size: 2rem;
  color: yellow;
  border: none;
}

nav {
  color: white;
  flex: 1;
  background-color: #5c0120;
  position: relative;
  z-index:50;
}

nav button /* The button to close the nav on mobile. */{
  margin:1rem;
}

.site-title{
  font-size: 2rem;
  line-height: 5rem;
  text-align:center;
}

#site-title img{
  width: 70%;
  margin-top:1rem;
}

#main {
  flex: 5;
  padding: 7rem 5rem;
  position: relative;
  background-color: #DDD;
  z-index: 0;
}

#menu{
  list-style:none;
  padding:0;
  width: 20rem;
  position: relative;
  float: right;
  right: -3rem;
  line-height:6rem;
  margin-top:4rem;
  z-index:100;
}

#menu li{
  font-size: 3rem;
  border-radius: 3rem;
  text-align:right;
  display:block;
  height: 6rem;
  margin-bottom:1rem;
  color:white;
}

#menu li a {
  color: inherit;
  text-decoration: none;
  display:block;
}

#menu li:hover {
  background-color: white;
  color: #5c0120;
}

#menu i{
  line-height:5.6rem;
  width: 6rem;
  height: 6rem;
  float: right;
  border: 0.2rem solid #5c0120;
  border-radius:3rem;
  color: #5c0120;
  background-color:white;
  vertical-align: middle;
  text-align: center;
  margin-left: 0.5rem;
  font-size: 5rem;
  transition: transform 1s;
}

#menu li:hover i{
  animation: spin 5s linear infinite;
  transition: transform 1s;
}


.page-title {
  color: #5c0120;
  background-color:white;
  box-shadow: 0 0.2rem 0.2rem #AAAAAA;
  position: absolute;
  left:0;
  right:0;
  top:0;
  font-size: 2rem;
  margin: 0;
  padding-left: 6rem;
  line-height: 5rem;
  width: auto; 
}



#main section{
  background-color:white;
  padding: 2rem;
}

.postdate{
  color: grey;
}

#footer {
  width: 100%;
  background-color: #4b0009;
  color: white;
  text-align:center;
  padding: 0.5rem;
}

/* Utility classes */
.fw {
  width: 100%;
}

.round{
  border-radius: 50%;
}

.fr {
  float: right;
}

@keyframes spin {
  from{
    transform: rotate(0deg);
  }
  to{
    transform: rotate(360deg);
  }
}

@media (min-width:1001px){
  .mobile-only{
    display:none !important;
  }
}

@media (max-width:1000px){
  nav{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    transform:translate(-120%, 0);
    transition:transform 0.5s;
  }
  
  nav.open{
    transform: translate(0, 0);
    transition: transform 0.5s;
  }
  
  #main {
    padding: 6rem 1rem;
  }
  
  .page-title{
    padding-left: 1rem;
  }
  
  nav .site-title{
    display:none;
  }
}
!

JS 

              
                var btn = document.getElementById("open-nav");
var btn2 = document.getElementById("close-nav");
var main = document.getElementById("main");
var nav = document.getElementById("nav");
var toggleNav = function(){
  nav.classList.toggle("open");
  console.log("toggle");
}
main.addEventListener("click", function(e){
  console.log(e.target)
  window.bbb = e.target;
  if(! (e.target.id === "open-nav" || e.target.parentElement.id === "open-nav")){
    nav.classList.remove("open");
  }
})

btn.addEventListener("click", toggleNav);
btn2.addEventListener("click", toggleNav);
!
999px

Console