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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

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.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="container">
<h1>Mengganti Background Blog Secara Random</h1>
<span>
  <h3>Gambar background akan berubah apabila halaman di refresh</h3>
  <input type="button" value="Refresh Page" onclick="refreshPage()"></input>
  <p>How to use: <a href="https://www.caramanual.com/2018/11/memasang-gambar-background-random-di-blogger.html" title="Cara Memasang Gambar Background Random di Blogger">Cara Memasang Gambar Background Random di Blogger</a></p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus sed pretium elit, id varius eros. Phasellus rutrum ligula risus, eget ornare quam faucibus ut. Pellentesque cursus porta ligula, eget pellentesque erat feugiat vestibulum. In odio ante, gravida nec arcu a, luctus euismod erat. Nam eu mattis nisl. Duis porta sapien at dapibus porttitor. Duis ullamcorper lectus a vehicula auctor. Vestibulum in pretium nibh. Maecenas mi dui, sollicitudin ut sem eu, congue mollis lacus.
</br> </br>
Praesent fermentum eros quam, sit amet facilisis neque auctor sagittis. Etiam lacinia purus quis ex commodo, nec faucibus enim lobortis. Fusce libero lacus, porta id urna vel, viverra placerat eros. In commodo sed libero ut interdum. In iaculis augue eu diam varius, quis venenatis ipsum placerat. Duis ac dignissim lectus. Donec porttitor at sem non condimentum. Suspendisse potenti. Etiam semper ex eu risus dictum vulputate. Aenean mollis dolor tellus, rutrum egestas nisi congue ac.
</br> </br>
Fusce et sem vel nulla viverra suscipit. Praesent suscipit sem luctus, fringilla turpis non, scelerisque risus. Nulla sed venenatis purus. Ut suscipit luctus enim, a iaculis ipsum congue a. Etiam sed quam purus. Phasellus vel massa maximus, mollis neque sit amet, fermentum urna. Donec tincidunt augue ut posuere blandit. Aliquam massa nibh, tristique at ex sed, sagittis tincidunt nisi. Maecenas sollicitudin dapibus imperdiet. Quisque odio felis, ullamcorper consequat sapien nec, gravida dapibus sem.</p>
</span>
</div>
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700);
body {
  background: #f1f1f1 none repeat scroll top left;
  font-family: 'Open Sans', sans-serif;
  margin: 0;
  padding: 0;
  position: relative;
  line-height: normal;
}

a,
a:visited {
  color: #555;
  outline: none;
  text-decoration: none;
}

a:hover,
a:focus,
a:visited:hover {
  color: #22a1c4;
  text-decoration: none;
}

.container {
  max-width: 768px;
  margin: 1% auto;
  padding: 30px;
  background: #fff;
  color: #95a5a6;
  font-family: 'Open Sans', sans-serif;
  font-size: 1em;
  line-height: normal;
}

.container h1,
.container h2 {
  display: block;
  text-align: center;
  margin-bottom: 30px;
  font-size: 2em;
  font-weight: 700;
  color: #336699;
}

.container h2 {
  margin-top: 30px;
}
.container h3 {
  text-align:center;
}
.container input {
  margin: 30px auto;
  text-align:center;
  display:table;
  padding:10px 15px;
  font-size:16px;
  background:#8092e9;
  color:#fff;
  border:0;
  border-radius:1px;
  cursor:pointer;
  transition:all .3s
}
.container input:hover,.container input:active {
  background:#3c5aeb;
  color:#fff;
  outline:none
}
!

JS 

              
                //<![CDATA[
var Background=new Array;Background[0]="#f5f5f5 url('https://1.bp.blogspot.com/-Vb2jzLkkeB0/W-uPL05UN2I/AAAAAAAAHLY/Wg2PFESPjOkjEIr0BGjT5N51kWg3SHO-QCLcBGAs/s320/background%2B1.jpg') no-repeat top center fixed",Background[1]="#f5f5f5 url('https://1.bp.blogspot.com/-biufA2HFHVo/W-uPLiIpZWI/AAAAAAAAHLU/nuhIkdEHXvchsvdyp_4uacDBaNIkH2VCgCLcBGAs/s320/background%2B2.jpg') no-repeat top center fixed",Background[2]="#f5f5f5 url('https://1.bp.blogspot.com/-Af-oe9q1kQo/W-uPLx2qlFI/AAAAAAAAHLc/DkZPwegM51wP1lRhE3nX3JWUnmZbuGp0wCLcBGAs/s320/background%2B3.jpg') no-repeat top center fixed",Background[3]="#f5f5f5 url('https://1.bp.blogspot.com/-Xg-yRiuI7ns/W-uPNRZwxzI/AAAAAAAAHLg/NZnhxDs2B7kN3Umy5h8OJvMZi0Qu3E-vwCLcBGAs/s320/background%2B4.jpg') no-repeat top center fixed";var random=Math.floor(4*Math.random());document.write("<style>"),document.write("body {"),document.write("background: "+Background[random]+";"),document.write("background-size:100%;"),document.write(" }"),document.write("</style>");
//]]>
function refreshPage() {
  window.location.href = window.location.href;
}
!
999px

Console