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HTML

              
                <div class="full">
  <h1>【jQuery】動画を全画面表示にして中央に表示する、固定背景にしておしゃれにしてみる | 125naroom</h1>
</div>

<section>
  <p class="_a"><a href="https://125naroom.com/web/3857" target="_blank" class="link">詳しくはこちら</a></p>
</section>

<footer>
  <p class="_a"><a href="https://125naroom.com/_____web_" target="_blank" class="link">125naroom</a></p>
</footer>

<div class="bg_statement">
  <div class="fit">
    <video src="https://125naroom.com/demo/video/itukanokoto_b.mp4" class="fitsize" preload="metadata" playsinline autoplay loop muted><p>動画を再生するにはvideoタグをサポートしたブラウザが必要です。</p></video>
  </div>
</div>
              
            
!

CSS

              
                /*=========
.bg_statement(固定背景にする)
=========*/

.bg_statement {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
}

/*=========
.fit
=========*/

.fit {
  position: relative;
  overflow: hidden;
}
.fitsize {
  position: absolute;
}

/*=========
base
=========*/

html, body {
  margin: 0;
  padding: 0;
}
body {
  font-family: YuGothic, "游ゴシック体", "Yu Gothic", "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, "MS Pゴシック", "MS PGothic", sans-serif;
  letter-spacing: .025em;
  line-height: 1.8;
}
* {
  box-sizing: border-box;
}
.full {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
section {
  background: #fff;
  padding: 10em 0;
}
footer {
  padding: 10em 0;
}
h1 {
  font-size: 22px;
  line-height: 2.0;
  padding: 1em .5em;
  margin: 0;
  position: relative;
  border-top: 4px solid #f2f2f2;
  border-bottom: 4px solid #f2f2f2;
  text-align: center;
}
h1:after {
  content: "";
  display: block;
  position: absolute;
  background-color: #fff689;
  width: 20%;
  height: 4px;
  bottom: -4px;
  left: 0;
  right: 0;
  margin: 0 auto;
}
._a {
  max-width: 300px;
  margin: 0 auto;  
}
._a a {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 2.0em 1.0em;
  border: 1px solid #222222;
  background: linear-gradient(to right, #ffffff 50%, #222222 50%);
  background-size: 200% auto;
  color: #222222;
  font-size: 14px;
  text-decoration: none;
  text-align: center;
  transition: .3s;
  position: relative;
}
._a a:after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 100%;
  height: 100%;
  border-right: 1px solid #222222;
  border-bottom: 1px solid #222222;
}
._a a:hover {
  color: #ffffff;
  background-position: -100% 0;
}
              
            
!

JS

              
                jQuery(function($){
	var winH = $(window).height();
	//全画面表示の場所を指定する
	$('.fit').outerHeight(winH);

	$(window).on('load',function(){
		//画像、動画のクラスを決める
		setBgImg($('.fitsize'));
	});

	$(window).on('resize',function(){
		//リサイズ指定
		winH = $(window).height();
		$('.fit').outerHeight(winH);
		
		setBgImg($('.fitsize'));
	});

	function setBgImg(object){
		//画像サイズ取得
		var imgW = object.width();
		var imgH = object.height();
		
		//ウィンドウサイズ取得
		var winW = $(window).width();
		var winH = $(window).height();	

		//幅・高さの拡大・縮小率取得
		var scaleW = winW / imgW;
		var scaleH = winH / imgH;

		//幅・高さの拡大・縮小率の大きいものを取得
		var fixScale = Math.max(scaleW, scaleH);

		//画像の幅高さを設定
		var setW = imgW * fixScale;
		var setH = imgH * fixScale;

		//画像の位置を設定
		var moveX = Math.floor((winW - setW) / 2);
		var moveY = Math.floor((winH - setH) / 2);

		//設定した数値でスタイルを適用
		object.css({
			'width': setW,
			'height': setH,
			'left' : moveX,
			'top' : moveY
		});
	}
});
              
            
!
999px

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