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HTML

About HTML Preprocessors

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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://assets.codepen.io/6329135/reset.css">
</head>

<body>
  <header id="header">
    <h1>Beach</h1>
    <div id="video-area">
      <video id="video" poster="img/movie.jpg" webkit-playsinline playsinline muted autoplay loop>
        <!--
        poster：動画ファイルが利用できない環境で代替表示される画像
        webkit-playsinline：iOS 9までのSafari用インライン再生指定
        playsinline：iOS 10以降のSafari用インライン再生指定
        muted：音声をミュートさせる
        autoplay：動画を自動再生させる
        loop：動画をループさせる
        controls：コントロールバーを表示する
    -->
        <source src="https://assets.codepen.io/6329135/movie.mp4" type="video/mp4">
        <p>動画を再生できる環境ではありません。</p>
      </video>
      <!--/video-area-->
    </div>
  </header>
  <div id="container">
    <p>This is test movie.</p>
    <!--/container-->
  </div>
</body>
!

CSS 

              
                @charset "utf-8";

/*========= 背景動画設定のCSS ===============*/

/*header設定*/
#header {
  position: relative; /*h1の中央寄せ配置の起点とするためのrelative*/
  height: 100vh; /*高さを全画面にあわせる*/
}

#video-area {
  position: fixed;
  z-index: 1; /*最背面に設定*/
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  overflow: hidden;
}

#video {
  /*天地中央配置*/
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /*縦横幅指定*/
  width: 177.77777778vh; /* 16:9 の幅 → 16 ÷ 9＝ 177.77% */
  height: 56.25vw; /* 16:9の幅 → 9 ÷ 16 = 56.25% */
  min-height: 100%;
  min-width: 100%;
}

/*見出し設定*/
h1 {
  /*要素の配置*/
  position: fixed;
  z-index: 2; /*下から2番目に表示*/
  /*要素を天地中央寄せ*/
  top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
  /*見た目の調整*/
  color: #fff;
  text-shadow: 0 0 15px #666;
  font-size: 20vw;
  opacity: 0.7;
}

/*========= レイアウトのためのCSS ===============*/

#container {
  position: relative; /*relativeを指定してfixed指定をした#video-areaの上に表示*/
  z-index: 3; /*一番上に表示*/
  background: #000;
  padding: 80vh 0 15vh 0;
  text-align: center;
  opacity: 0.5;
}

p {
  color: #fff;
  font-size: 5vw;
}
!

JS
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999px

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