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HTML 

              
                <header id="header">
  <div class="inner wrapper">
    <h1 class="logo">
      <a href="index.html"><img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-logo.png" alt="GSAPセミナー by りょーすけ@codolife6期生"></a>
    </h1>
    <nav>
      <ul>
        <li><a href="#news">NEWS</a></li>
        <li><a href="#about">ABOUT</a></li>
        <li><a href="#business">BUSINESS</a></li>
        <li><a href="#company">COMPANY</a></li>
      </ul>
    </nav>
  </div>
  <a class="contact" href="#">お問い合わせ</a>
</header>
<main>
    <div id="mainvisual">
        <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo.jpg">
        <span class="mask"></span>
        <div class="copy-wrapper">
            <h2 class="copy">
                <span>ア</span>
                <span>二</span>
                <span>メ</span>
                <span>ー</span>
                <span>シ</span>
                <span>ョ</span>
                <span>ン</span>
                <span>付</span>
                <span>与</span>
            </h2>
            <p>
                <span class="green">G</span>
                <span class="green">S</span>
                <span class="green">A</span>
                <span class="green">P</span>
                <span>セ</span>
                <span>ミ</span>
                <span>ナ</span>
                <span>ー</span>
            </p>
        </div>
    </div>

    <div class="top-container">
        <section id="news" class="wrapper">
            <h2 class="section-title">
            <span class="en">NEWS</span>
            <span class="ja">ニュース</span>
            </h2>

            <ul class="list">
            <li>
                <div class="date-area">
                <time datetime="2021-01-01">2021.01.01</time>
                <span>NEWS</span>
                </div>
                <p>タイトルタイトルタイトルタイトル</p>
            </li>
            <li>
                <div class="date-area">
                <time datetime="2021-01-01">2021.01.01</time>
                <span>PRESS</span>
                </div>
                <p>タイトルタイトルタイトルタイトル</p>
            </li>
            <li>
                <div class="date-area">
                <time datetime="2021-01-01">2021.01.01</time>
                <span>NEWS</span>
                </div>
                <p>タイトルタイトルタイトルタイトル</p>
            </li>
            </ul>
        </section>

        <section id="about">
            <div class="img">
            <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-about.jpg">
            </div>

            <div class="text">
            <h2 class="section-title">
                <span class="en">ABOUT</span>
                <span class="ja">私たちについて</span>
            </h2>
            <p>
                テキストテキストテキストテキストテキストテキスト
                テキストテキストテキストテキストテキストテキスト
            </p>
            <p>
                テキストテキストテキストテキストテキストテキスト
                テキストテキストテキストテキストテキストテキスト
            </p>
            <p>
                テキストテキストテキストテキストテキストテキスト
                テキストテキストテキストテキストテキストテキスト
            </p>
            </div>
        </section>

        <section id="business" class="wrapper">
            <h2 class="section-title">
            <span class="en">BUSINESS</span>
            <span class="ja">事業内容</span>
            </h2>

            <div class="flex">
            <div class="left">
                <div class="item">
                <p class="title">Web制作・マーケティング</p>
                <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-business01.jpg" alt="">
                </div>
                <div class="item">
                <p class="title">インターネットメディア事業</p>
                <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-business02.jpg" alt="">
                </div>
            </div>

            <div class="right">
                <div class="item">
                <p class="title">プロモーション企画・制作</p>
                <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-business03.jpg" alt="">
                </div>
                <div class="item">
                <p class="title">ソーシャル企画・運営</p>
                <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-business04.jpg" alt="">
                </div>
            </div>
            </div>
        </section>

        <section id="company" class="wrapper">
            <div class="text">
            <h2 class="section-title">
                <span class="en">COMPANY</span>
                <span class="ja">会社情報</span>
            </h2>

            <dl class="info">
                <dt>会社名</dt>
                <dd>ウェブエンターテイメントデザイン株式会社</dd>
                <dt>所在地</dt>
                <dd>東京都渋谷区桜丘町99-9 West Building 3F</dd>
                <dt>代表</dt>
                <dd>ＸＸＸＸＸＸ</dd>
                <dt>設立</dt>
                <dd>2021年1月1日</dd>
                <dt>資本金</dt>
                <dd>3,000,000円</dd>
                <dt>事業内容</dt>
                <dd>Web制作・マーケティング</dd>
                <dd class="add">インターネットメディア事業</dd>
                <dd class="add">プロモーション企画・制作</dd>
                <dd class="add">ソーシャル企画・運営</dd>
            </dl>
            </div>

            <div class="img">
                <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-company.jpg">
                <span class="mask"></span>
            </div>
        </section>
    </div>
</main>
<footer id="footer">
  <div class="wrapper">
    <div class="flex">
      <div class="logo">
        <img src="https://ryo-sukeblog.net/wp-content/uploads/2022/09/gsap-coding-demo-logo.png" alt="Web Entertainment Design">
      </div>
      <div class="info">
        <p>
          Web Entertainment Design Inc.<br>
          West Building 3F<br>
          9-99 Sakuragaokacho Shibuya-ku<br>
          Tokyo, Japan 150-0031
        </p>
        <p>T/99-9999-9999</p>
      </div>
    </div>
    <p class="copyright">&copy; Web Entertainment Design Inc.</p>
  </div>
</footer>
!

CSS 

              
                @charset "UTF-8";

html {
  font-size: 100%;
}
body {
  color: #000;
  font-size: 0.875rem;
  font-family: 'Noto Sans JP',sans-serif;
  position: relative;
}
a {
  color: #000;
  font-size: 0.875rem;
  text-decoration: none;
}
img {
  max-width: 100%;
  vertical-align: bottom;
}
li {
  list-style: none;
}

.logo {
  width: 100px;
  line-height: 1px;
  margin-right: 60px;
}
.logo a {
  display: block;
}
.section-title {
  font-weight: normal;
  line-height: 1;
  margin-bottom: 50px;
}
/*
疑似要素を使って下線を引く
*/
.section-title::after {
  content: "";
  width: 40px;
  height: 1px;
  background-color: #000;
  display: block;
}
/*
「display: inline-block;」を設定してブロック化することで、
改行されてmargin-bottomが使用できるようになる
*/
.section-title .en {
  display: block;
  font-size: 2.25rem;
  letter-spacing: 0.3em;
  margin-bottom: 10px;
}
.section-title .ja {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 36px;
}
/*
横幅を設定するための共通クラス
*/
.wrapper {
  width: 100%;
  max-width: 1032px;
  padding: 0 16px;
  margin: 0 auto;
}

/*-------------------------------------------
ヘッダー
-------------------------------------------*/
#header {
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  margin: 0 auto;
  transform: translate(0,-100%);
}
#header .inner {
  display: flex;
  align-items: center;
}
#header .inner ul {
  display: flex;
  align-items: center;
}
#header .inner li {
  margin-right: 30px;
}
#header .inner li:last-child {
  margin-right: 0;
}
#header .contact {
  width: 200px;
  height: 80px;
  line-height: 80px;
  background-color: #000;
  color: #fff;
  font-size: 0.75rem;
  display: inline-block;
  text-align: center;
}
#header .contact:hover {
  background-color: #333;
}

/*-------------------------------------------
Mainvisual
-------------------------------------------*/
#mainvisual {
  margin-bottom: 100px;
  position: relative;
}
#mainvisual .mask{
  content:'';
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: rgba(0,0,0,.25);
  opacity: 0;
}
.copy-wrapper{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
}
.copy-wrapper h2{
  font-size: 72px;
  letter-spacing: .1em;
  display: flex;
  will-change: transform,opacity;
  overflow: hidden;
}
.copy-wrapper span{
  display: block;
  will-change: transform,opacity;
  font-weight: 600;
}
.copy-wrapper h2 .pad{
  padding-left: 12px;
}
.copy-wrapper p{
  font-size: 50px;
  font-weight: 500;
  letter-spacing: .1em;
  overflow: hidden;
}
.copy-wrapper p{
  display: flex;
}
.copy-wrapper span{
  display: block;
}
/*
メインビジュアルを画面の高さに合わせる
headerの高さが80pxあるので、100vhから80px分だけマイナスする
*/
#mainvisual img {
  width: 100%;
  height: 100vh;
  object-fit: cover;
  opacity: 0;
}

/* container */
.top-container{
  width: 100%;
  height: fit-content;
  background-color: #f0f0f0f0;
  padding-top: 20px;
}

/*-------------------------------------------
News
-------------------------------------------*/
#news {
  margin-bottom: 120px;
}
#news .list {
  display: flex;
  justify-content: space-between;
}
/*
「width: calc(100%/3);」で横幅を3等分する
*/
#news .list li {
  width: calc(100%/3);
  border-right: solid 1px #000;
  padding: 10px 20px;
}
#news .list li:first-child {
  padding-left: 0;
}
#news .list li:last-child {
  border-right: none;
  padding-right: 0;
}
#news .list li .date-area {
  margin-bottom: 16px;
}
#news .list li .date-area span {
  width: 50px;
  height: 20px;
  line-height: 20px;
  background-color: #000;
  color: #fff;
  display: inline-block;
  font-size: 0.75rem;
  margin-left: 10px;
  text-align: center;
}

/*-------------------------------------------
About
-------------------------------------------*/
#about {
  display: flex;
  margin-bottom: 120px;
}
#about .img {
  width: 55%;
  height: 400px;
  overflow: hidden;
}
#about .img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.5);
}
#about .text {
  width: 45%;
  padding: 180px 5% 0 5%;
}
#about .text p {
  line-height: 2.2;
}

/*-------------------------------------------
Business
-------------------------------------------*/
#business {
  margin-bottom: 120px;
}
#business .flex {
  display: flex;
  justify-content: space-between;
  padding: 0 10%;
}
#business .flex .left {
  width: 46%;
  margin-top: 100px;
}
#business .flex .right {
  width: 46%;
}
#business .flex .item {
  margin-bottom: 50px;
}
#business .flex .item:last-child {
  margin-bottom: 0;
}
#business .flex .title {
  font-weight: bold;
  margin: 0 0 10px 18px;
  position: relative;
}
/*
疑似要素でタイトルの横線を引く
*/
#business .flex .title::before {
  content: "";
  width: 8px;
  height: 1px;
  background-color: #000;
  position: absolute;
  top: 50%;
  left: -18px;
}

/*-------------------------------------------
Company
-------------------------------------------*/
/*
テキストと画像はpositionを使って配置
子要素の「position: absolute;」で高さがなくなるため、
「height: 750px;」を指定して高さを確保
*/
#company {
  height: 750px;
  display: flex;
  align-items: center;
  position: relative;
}
#company .text {
  width: 55%;
  background-color: #fff;
  padding: 100px 8% 100px 6%;
  position: absolute;
  top: 0;
  left: 0;
}
#company .img {
  width: 53%;
  height: 400px;
  position: absolute;
  top: 115px;
  right: 0;
  overflow: hidden;
}
#company .img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
}
#company .img .mask {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: white;
  display: block;
  will-change: transform;
  transition-property:transform;
}
#company .info {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
#company .info dt {
  width: 20%;
  margin-top: 10px;
}
/*
1つめのdtにはmargin-topを設定しない
*/
#company .info dt:first-of-type {
  margin-top: 0;
}
#company .info dd {
  width: 80%;
  margin-top: 10px;
}
/*
1つめのddにはmargin-topを設定しない
*/
#company .info dd:first-of-type {
  margin-top: 0;
}
#company .info .add {
  margin-left: 20%;
}

/*-------------------------------------------
footer
-------------------------------------------*/
#footer {
  background-color: #fff;
  padding-bottom: 20px;
}
#footer .flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0;
}
#footer .flex .logo {
  margin-right: 0;
}
#footer .copyright {
  font-size: 0.625rem;
}

/*-------------------------------------------
SP
-------------------------------------------*/
@media screen and (max-width: 900px) {
  .logo {
    width: 80px;
    margin: 8px 0;
  }
  .section-title {
    margin-bottom: 34px;
  }
  .section-title .ja {
    margin-bottom: 24px;
  }

  /*-------------------------------------------
  ヘッダー
  -------------------------------------------*/
  #header .inner {
    flex-direction: column;
    align-items: flex-start;
  }
  #header .contact {
    display: none;
  }

  /*-------------------------------------------
  Mainvisual
  -------------------------------------------*/
  #mainvisual {
    margin-bottom: 80px;
  }

  /*-------------------------------------------
  News
  -------------------------------------------*/
  #news {
    margin-bottom: 80px;
  }
  #news .list {
    flex-direction: column;
  }
  #news .list li {
    width: 100%;
    border-right: none;
    padding: 10px 0;
    margin-bottom: 20px;
  }
  #news .list li:last-child {
    margin-bottom: 0;
  }

  /*-------------------------------------------
  About
  -------------------------------------------*/
  #about {
    flex-direction: column;
    margin-bottom: 80px;
  }
  #about .img {
    width: 100%;
    margin-bottom: 30px;
    transform-origin: bottom;
  }
  #about .img img {
    height: 300px;
  }
  #about .text {
    width: 100%;
    padding: 0 16px;
  }

  /*-------------------------------------------
  Business
  -------------------------------------------*/
  #business {
    margin-bottom: 80px;
  }
  #business .flex {
    flex-direction: column;
    padding: 0;
  }
  #business .flex .left {
    width: 100%;
    margin: 0 0 30px 0;
  }
  #business .flex .right {
    width: 100%;
  }
  #business .flex .item {
    text-align: center;
    margin-bottom: 30px;
  }
  #business .flex .title {
    text-align: left;
  }

  /*-------------------------------------------
  Company
  -------------------------------------------*/
  /*
  「position: static;」でrelativeを解除
  */
  #company {
    height: auto;
    flex-direction: column;
    position: static;
  }
  /*
  「position: static;」でabsoluteを解除
  */
  #company .text {
    width: 100%;
    padding: 40px 20px;
    margin-bottom: 20px;
    position: static;
  }
  /*
  「position: static;」でabsoluteを解除
  */
  #company .img {
    width: 100%;
    padding: 0;
    position: relative;
    top: 0;
  }
  #company .info {
    flex-direction: column;
  }
  #company .info dt {
    width: 100%;
    margin-top: 20px;
  }
  #company .info dd {
    width: 100%;
    margin-top: 5px;
    padding-left: 14px;
  }
  #company .info dd:first-of-type {
    margin-top: 5px;
  }
  #company .info .add {
    margin-left: 0;
  }

  /*-------------------------------------------
  footer
  -------------------------------------------*/
  #footer .flex {
    flex-direction: column;
    align-items: flex-start;
  }
  #footer .flex .logo {
    margin-bottom: 10px;
  }
}
!

JS 

              
                window.addEventListener('load',function(){

    gsap.registerPlugin(ScrollTrigger);

    /* OPENING ANIMATION PATTERN01 */
    const openingTL = gsap.timeline({delay:.2});
    openingTL
    .to('#mainvisual img',{autoAlpha:1,duration:1.2})
    .set('#mainvisual .mask',{autoAlpha:1},'<')
    .fromTo('#mainvisual h2',{autoAlpha:0,scale:1.1},{autoAlpha:1,scale:1})
    .fromTo('#mainvisual p',{autoAlpha:0,scale:1.2},{autoAlpha:1,scale:1})
    .fromTo('#header',{y:'-100%'},{y:'0%'})
    
    /* OPENING ANIMATION PATTERN02 */
    // const openingTL = gsap.timeline({delay:.2});
    // openingTL
    // .to('#mainvisual img',{autoAlpha:1,duration:1.2})
    // .set('#mainvisual .mask',{autoAlpha:1},'<')
    // .fromTo('#mainvisual h2 span',{y:'100%'},{y:'0%',stagger:.035})
    // .fromTo('#mainvisual p span',{y:'100%'},{y:'0%',stagger:.05},'>-.5')
    // .to('#header',{y:'0%'})
    

})
!
999px

Console