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About the <head>

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CSS

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CSS Base

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JavaScript

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HTML 

              
                <header>  
 <h1>Vertical Centering: Everything You Need to Know</h1>
    <a href="http://webdesignerwall.com/tutorials/css-vertical-centering-everything-need-know" target="_blank">View Tutorial</a>
</header>

<div class="intro">*Hover over the text to see how each method centers it within its parent.</div>

<div class="container">
  <h2>absolute</h2>
  <div class="item one"><p>To be able under all circumstances to practice five things constitutes perfect virtue; these five things are gravity, generosity of soul, sincerity, earnestness and kindness.</p></div>
</div>
<div class="container">
  <h2>table</h2>
  <div class="item two"><p>To be able under all circumstances to practice five things constitutes perfect virtue; these five things are gravity, generosity of soul, sincerity, earnestness and kindness.</p></div>
</div>
<div class="container">
  <h2>transform</h2>
  <div class="item three"><p>To be able under all circumstances to practice five things constitutes perfect virtue; these five things are gravity, generosity of soul, sincerity, earnestness and kindness.</p></div>
</div>
<div class="container">
  <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
 <h2>line height</h2>
  <div class="item four"><i class="fa fa-css3" aria-hidden="true"></i></div>
</div>
<div class="container">
  <h2>padding</h2>
  <div class="item five"><p>When I walk along with two others, from at least one I will be able to learn.</p></div>
</div>
<div class="container">
  <h2>flexbox</h2>
  <div class="item six"><p>To be able under all circumstances to practice six things constitutes perfect virtue; these six things are gravity, generosity of soul, sincerity, earnestness, kindness and vertical alignment.</p><a href="#"> Link </a></div>
</div>
<div class="container">
  <h2>Combined Elements</h2>
  <div class="item with-image">
    <figure><img src="https://24.media.tumblr.com/1d8dd5361a12d9c51077764adf9a1158/tumblr_mvdci7SSY51r4mh0bo1_r1_500.gif"></figure>
    <div class="content"><h3>Maybe A Title</h3><p>When I walk along with two others, from at least one I will be able to learn.</p></div>
  </div> 
</div>
!

CSS 

              
                html {
  box-sizing: border-box;
}

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

body {
  background: linear-gradient(90deg, #f598a8, #f6edb2);
  align-items: center;
  height: 100vh;
  position: relative;
  font-family: 'source sans pro', sans-serif;
}
.intro{
  font-size: 1.2rem;
  display: block;
  text-align: center;
  color: #555;
  font-style: italic;
}
.container {
  width: 80vw;
  margin: 2vw auto;
  border: 0.25rem solid rgba(255, 255, 255, 0.1);
  padding: 2vw;
  transition: border 0.25s ease;
}
.container h2{
    padding: 0 0 0 1rem;
    opacity: 0.25;
    font-size: 2rem;
    transition: opacity 0.25s ease;
 }
.item {
  position: relative;
  background-color: white;
  margin: 1rem;
  padding: 1rem;
  min-height: 33vh;
  overflow: hidden;
  font-size: 1.25rem;
  color: rgba(0, 0, 0, 0.25);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
  transition: all 0.25s ease;
}
.item:hover {
    color: rgba(0, 0, 0, 0.75);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
}
.item p{
  margin: 0;
  padding: 0;
  border: 0.25rem dashed rgba(239, 230, 195, 0.1);
}
.item:hover p {
   border: 0.25rem dashed rgba(239, 230, 195, 0.75);
}
.item:hover p:after {
    opacity: 0.5;
}
/* Positioning */

/* Absolute */

.one p{
    position:absolute;
    top: 33%;
    right:0;
    bottom:0;
    left:0;
    margin: auto;
    padding: 0 2rem;
}
/* table */
.two{
  display: table;
}
.two p{
  display: table-cell;
  vertical-align: middle;
}
/* translate */
.three{
  height: 33vh;
}
.three p{
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
}
/* line height */
.four{
  width: 4rem;
  height: 4rem;
  border-radius: 100%;
  margin: 0 auto;
  padding: 0;
  min-height: auto;
  line-height: 4rem;
  text-align: center;
}


/* padding */
.five{
  padding: 16.5vh 8.25vh;
  text-align: center;
}


/* flexbox */
.six{
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* flexbox with image */
.with-image{
  height: auto;
  display: flex;
  flex-direction: row;
}
.with-image img, .with-image .content{
  width: calc(50%);
}
.with-image figure img{
  width: 100%;
  height: auto;
  object-fit: contain;
}
.content{
  margin: 0 2rem;
  align-self: center;
}


/* General style */
a{
    font-size: .8rem;
    text-decoration: none;
    color: #999;
    text-transform: uppercase;
    font-family: sans-serif;
}

header{
  width: 100%;
  display: block;
  background: #FFF;
  height: 40px;
  margin-bottom: 4%;
  color: #ccc;
  font-family: sans-serif;
  font-weight: bold;
  box-shadow: 0px 2px 0px 0px rgba(125,121,125,0.3);
  overflow: hidden;
}
header h1, header a{
  display: inline-block;
  font-size: .8rem;
  margin: auto 10px;
  line-height: 40px;

}
header h1{
    text-transform: uppercase;
    letter-spacing: 1px;
}
header a{
  text-decoration: none;
  background-color: #eee;
  color: #999;
  padding: 0 20px;
  transition: all ease-in-out .3s;
}
header a:hover{
  background-color: #93dfec;
  color: #eee;
  margin-left: -3px;
}



@media screen and (max-width: 667px){
  .item:not(.four){
    min-height: 50vh;
  }
  .item span{
    font-size: 4vw;
  }
  .with-image{
    flex-direction: column;
    justify-content: center;
  }
 .with-image img, .with-image .content{
  text-align: center;
  width: calc(100%);
  height: calc(100%);
}
!

JS
!
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