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HTML

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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

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.

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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 

              
                <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>WEB先案内の名言コレクション</h1>
  </header>
  <p class="caution">スクロールすると名言３のセクションのみ<br>右下に「PAGE TOP」のリンクが右側から現れます<br>↓ ↓ ↓</p>
  <main>
    <section id="area-1">
      <h2>名言 1</h2>
      <p>人はそれぞれ事情をかかえ、平然と生きている</p>
      <p>ベストを尽くして失敗したら、ベストを尽くしたってことさ</p>
      <p>いちばんいけないのはじぶんなんかだめだと思いこむことだよ</p>
      <p>この世に生を受けたこと。それ自体が最大のチャンスではないか</p>
      <!--/area1-->
    </section>
    <section id="area-2">
      <h2>名言 2</h2>
      <p>ろくな晩じゃねぇや。寝ちまえ、寝ちまえ。寝て起きりゃ別の日だ</p>
      <p>世の中ってオレより頭のいい人のほうが多いんだ</p>
      <p>何かを捨てないと前に進めない</p>
      <p>弱気は最大の敵</p>
      <!--/area2-->
    </section>
    <section id="area-3">
      <h2>名言 3</h2>
      <p>いつか、必ず、チャンスの順番が来ると信じなさい</p>
      <p>前向きにもがき苦しむ経験は、すぐに結果に結びつかなくても、必ず自分の生きる力になっていく</p>
      <p>「ゴールは遠いなぁ」と、がっかりするのも道のりです</p>
      <p>「負けたことがある」というのが　いつか　大きな財産になる</p>
      <!--/area3-->
    </section>
    <section id="area-4">
      <h2>名言 4</h2>
      <p>前進できぬ駒はない</p>
      <p>「仕事はナメてかかって、真面目にやれ」と思っている。俺は、どの仕事もそうしてきているんです</p>
      <p>自分を少し抑えて、肩の力を抜けば、仕事は長続きする</p>
      <p>常に今日は明日の準備ですからね。今日やったことは必ず明日に返ってくるんです</p>
      <!--/area4-->
    </section>
    <section id="area-5">
      <h2>名言 5</h2>
      <p>強い者が勝つのではない。勝った者が強いのだ</p>
      <p>自分がわかっていないことがわかるということが一番賢いんです</p>
      <p>成功の反対は失敗ではなく「やらないこと」だ</p>
      <p>自分が幸せかどうかは、自分で決めるしかないのよ</p>
      <!--/area5-->
    </section>
    <!--/main-->
  </main>

  <footer id="footer">
    <p id="page-top"><a href="#">Page Top</a></p>
    <small>&copy; copyright.</small>
  </footer>

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>

</body>
!

CSS 

              
                @charset "utf-8";

/*========= ページトップのためのCSS ===============*/

/*リンクの形状*/
#page-top a {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #942d2f;
  border-radius: 5px;
  width: 60px;
  height: 60px;
  color: #fff;
  text-align: center;
  text-transform: uppercase;
  text-decoration: none;
  font-size: 0.6rem;
  transition: all 0.3s;
}

#page-top a:hover {
  background: #777;
}

@media screen and (max-width: 768px) {
  #page-top a:hover {
    background: #942d2f;
  }
}

/*リンクを右下に固定*/
#page-top {
  position: fixed;
  right: 10px;
  bottom: 10px;
  z-index: 2;
  /*はじめは非表示*/
  opacity: 0;
  transform: translateX(100px);
}

/*　左の動き　*/

#page-top.LeftMove {
  animation: LeftAnime 0.5s forwards;
}

@keyframes LeftAnime {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/*　右の動き　*/

#page-top.RightMove {
  animation: RightAnime 0.5s forwards;
}
@keyframes RightAnime {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 1;
    transform: translateX(100px);
  }
}

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

body {
  width: 100%;
  height: 100vh;
  vertical-align: middle;
}

h1 {
  font-size: 1.2rem;
}

h2 {
  font-size: 1.2rem;
  text-align: center;
  margin: 0 0 30px 0;
}

p {
  margin-top: 20px;
}

small {
  color: #fff;
  display: block;
  text-align: center;
  padding: 20px;
}

#header {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 20px;
}

section {
  padding: 15vh 30px;
}

section:nth-child(2n) {
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;

  background-image: linear-gradient(
    0deg,
    rgba(255, 255, 255, 1) 5%,
    rgba(252, 225, 208, 1) 15%,
    rgba(255, 173, 214, 1) 50%,
    rgba(162, 186, 245, 0.8) 80%,
    rgba(255, 255, 255, 1) 95%
  );
}

#footer {
  position: relative;
  z-index: 2;
}

.caution {
  color: red;
  text-align: center;
  font-size: clamp(12px, 2.5vw, 1.2rem);
  font-weight: bold;
  white-space: nowrap;
}
!

JS 

              
                //スクロールした際の動きを関数でまとめる
function setFadeElement() {
  var windowH = $(window).height(); //ウィンドウの高さを取得
  var scroll = $(window).scrollTop(); //スクロール値を取得

  //出現範囲の指定
  var contentsTop = Math.round($("#area-3").offset().top); //要素までの高さを四捨五入した値で取得
  var contentsH = $("#area-3").outerHeight(true); //要素の高さを取得

  //2つ目の出現範囲の指定※任意
  //var contentsTop2 = Math.round($('#area-5').offset().top);	//要素までの高さを取得
  //var contentsH2 = $('#area-5').outerHeight(true);//要素の高さを取得

  //出現範囲内に入ったかどうかをチェック
  if (
    scroll + windowH >= contentsTop &&
    scroll + windowH <= contentsTop + contentsH
  ) {
    $("#page-top").addClass("LeftMove"); //入っていたらLeftMoveをクラス追加
    $("#page-top").removeClass("RightMove"); //RightMoveを削除
    $(".hide-btn").removeClass("hide-btn"); //hide-btnを削除
  } //2つ目の出現範囲に入ったかどうかをチェック※任意
  //else if(scroll+windowH >= contentsTop2 && scroll+windowH <= contentsTop2+contentsH2){
  //$("#page-top").addClass("LeftMove");    //入っていたらLeftMoveをクラス追加
  //$("#page-top").removeClass("RightMove");   //RightMoveを削除
  //}//それ以外は
  else {
    if (!$(".hide-btn").length) {
      //サイト表示時にRightMoveクラスを一瞬付与させないためのクラス付け。hide-btnがなければ下記の動作を行う
      $("#page-top").addClass("RightMove"); //RightMoveをクラス追加
      $("#page-top").removeClass("LeftMove"); //LeftMoveを削除
    }
  }
}

// 画面をスクロールをしたら動かしたい場合の記述
$(window).scroll(function () {
  setFadeElement(); /* スクロールした際の動きの関数を呼ぶ*/
});

// ページが読み込まれたらすぐに動かしたい場合の記述
$(window).on("load", function () {
  setFadeElement(); /* スクロールした際の動きの関数を呼ぶ*/
});

// #page-topをクリックした際の設定
$("#page-top").click(function () {
  $("body,html").animate(
    {
      scrollTop: 0 //ページトップまでスクロール
    },
    500
  ); //ページトップスクロールの速さ。数字が大きいほど遅くなる
  return false; //リンク自体の無効化
});
!
999px

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