Position sticky Example

common.css

@charset "UTF-8";
html{color:#000;background:#FFF}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{margin:0;padding:0}table{border-collapse:collapse;border-spacing:0}fieldset,img{border:0}address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal}ol,ul{list-style:none}caption,th{text-align:left}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal}q:before,q:after{content:""}abbr,acronym{border:0;font-variant:normal}sup{vertical-align:text-top}sub{vertical-align:text-bottom}input,textarea,select{font-family:inherit;font-size:inherit;font-weight:inherit}input,textarea,select{*font-size:100%}legend{color:#000}

html { min-width: 1400px; -webkit-overflow-scrolling: touch; overflow-scrolling: touch; scroll-behavior: smooth; }
body { font-family: "Spoqa Han Sans", "Roboto", sans-serif; color: #1a1d33; }
div.wrap { width: 1400px; padding: 0 50px; margin: 0 auto; position: relative; box-sizing: border-box; }

section#intro { background: #f5f7fa url("../images/bg_intro.png") 50% 50%; width: 100%; height: 100vh; overflow: hidden; }
section#intro div.wrap { position: relative; top: 50%; transform: translateY(-50%); z-index: 1; }
section#intro header { padding-left: 268px; }
section#intro header:after { width: 100%; height: 2px; background: #1a1d33; position: absolute; left: -1060px; top: 157px; content: ""; display: block; }
section#intro header h1 { font-size: 93px; font-weight: 900; line-height: 80px;  }
section#intro header h1 span { display: block; color: transparent; text-stroke: 2px #1a1d33; -webkit-text-stroke: 2px #1a1d33; }
section#intro header p { font-size: 15px; position: absolute; top: 56px; left: 695px; }
section#intro h2 { font-size: 28px; font-family: "NanumSquare", sans-serif; font-weight: 700; letter-spacing: 10px; line-height: 41px; position: absolute; top: 6px; left: 50px; }
section#intro h2 span { font-size: 15px; font-weight: 400; letter-spacing: 0; vertical-align: top; line-height: 30px; }
section#intro ul { margin-top: 50px; }
section#intro li { margin-top: 16px; }
section#intro li:first-child { margin: 0; }
section#intro dt { font-size: 15px; font-weight: 500; line-height: 20px; }
section#intro dd { font-size: 14px; font-weight: 400; color: #6d6d6d; line-height: 20px; }
section#intro a.scroll { text-indent: -999999px; display: block; position: relative; bottom: -145px; border-radius: 9px; border: 1px solid #1a1d33; width: 18px; height: 32px;  }
section#intro a.scroll:after { background: #1a1d33; width: 2px; height: 5px; border-radius: 2px; position: absolute; top: 7px; left: 50%; transform: translateX(-50%); display: block; content: ""; animation: scrollAni 1.3s infinite .2s;  }

@keyframes scrollAni { 0% { transform: translateY(0); } 100% { transform: translateY(5px); opacity: 0; } }

section#contents { background: #fff; background-size: contain !important; width: 100%; margin-top: 50vh; min-width: 1400px; }
section#contents hr { display: none; }
section#contents div.wrap { position: relative; margin: 0 auto; min-width: 1400px; padding-bottom: 5vh; }

section#contents div.imgSlider { width: 796px; height: 467px; box-shadow: 0 0 54px 0 rgba(0, 0, 0, .2); position: sticky; top: 50%; transform: translateY(-50%); background: #fff; }
section#contents div.imgSlider div.nav { position: absolute; z-index: 99; right: -78px; bottom: 77px; background: #fff; height: 70px; width: 225px; transform: rotate(-90deg); }
section#contents div.imgSlider p.title { color: #313131; font-size: 12px; line-height: 70px; position: absolute; top: 0; left: 25px; text-align: left; }
section#contents div.imgSlider p.num { color: #b3b3b3; font-size: 11px; line-height: 70px; position: absolute; top: 0; right: 25px; text-align: left; letter-spacing: 1px; }

section#contents div.imgSlider button { display: none; }
section#contents div.imgSlider div.slider div.tns-item { width: 796px; height: 467px; }

section#contents div.title { padding: 50px 0 0 860px; width: 1400px; margin: 0 auto 80vh auto; box-sizing: border-box; position: relative; z-index: 0; }
section#contents div.title:nth-of-type(2) { margin-top: -17vh; }
section#contents div.title:last-child { margin: 0 auto 25vh auto; }
section#contents div.title:after { position: absolute; content: ""; font-size: 65px; font-weight: 800; color: #f1f1f1; display: block; top: 0; margin-left: -3px; z-index: -1; }
section#contents div.title.ideafestival:after { content: "MICRO WEB"; }
section#contents div.title.at:after { content: "UI WEB"; }
section#contents div.title.mobile:after { content: "MOBILE UIX"; }
section#contents div.title h2 { font-size: 35px; font-family: "NanumSquare", sans-serif; line-height: 44px; font-weight: 300; }
section#contents div.title h2 strong { font-weight: 800; display: block; }
section#contents div.title p { margin-top: 20px; font-size: 16px; line-height: 24px; color: #3e3e3e; font-weight: 400; }
section#contents div.title a { display: inline-block; margin-top: 35px; color: #fff; text-decoration: none; font-size: 14px; font-weight: 400; padding: 13px 18px 13px 72px; background: #121e54 url("../images/bg_arrow.svg") 18px 50% no-repeat; background-size: 41px; transition: background-color .3s; }
section#contents div.title a:hover, section#contents div.title a:focus { background: #1b2b72 url("../images/bg_arrow.svg") 18px 50% no-repeat; background-size: 41px; }

section#contents div.title ul.sliderControl { list-style: none; margin-top: 80px; text-align: right; padding-right: 120px; box-sizing: border-box; }
section#contents div.title ul.sliderControl li { display: inline-block; margin-right: 15px; }
section#contents div.title ul.sliderControl li:last-child { margin: 0; }
section#contents div.title ul.sliderControl li button { outline: 0; cursor: pointer; display: block; width: 12px; height: 20px; text-indent: -999999px; padding: 16px 10px; border: 0 none; background: none; opacity: .4; transition: opacity .2s; }
section#contents div.title ul.sliderControl li button:hover, section#contents div.title ul.sliderControl li button:active { opacity: 1; }
section#contents div.title ul.sliderControl li button:active { transform: translateY(1px); }
section#contents div.title ul.sliderControl li button.prev { background: url("../images/bg_leftArrow.svg") 50% 50% no-repeat; background-size: 11px; }
section#contents div.title ul.sliderControl li button.next { background: url("../images/bg_rightArrow.svg") 50% 50% no-repeat; background-size: 11px; }

footer { padding: 20px 10px; border-top: 1px solid #eee; font-size: 12px; color: #4d4d4d;  }
footer address { width: 1400px; margin: 0 auto; display: block; box-sizing: border-box; padding: 0 50px;  }

index.html

<!doctype html>
<html lang="ko">
<head>
  <meta charset="utf-8">
  <title>Dong-gri Handicraft</title>
  <meta name="author" content="dongri.me" />
  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:400,500,600,700,900&display=swap" />
  <link rel="stylesheet" href="https://spoqa.github.io/spoqa-han-sans/css/SpoqaHanSans-kr.css" />
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/moonspam/NanumSquare@1.0/nanumsquare.css" />
  <link rel="stylesheet" href="./common/css/style.css" />
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tiny-slider/2.9.1/tiny-slider.css" />
  <script src="common/js/common.js"></script>
</head>
<body>
  <section id="intro">
    <div class="wrap">
      <header>
        <h1><span>DONGRI</span>HANDICRAFT</h1>
         <p>— 2019.08.10</p>
      </header>
      <h2>주니어<br />디자이너,<br />동그리<span>dongri</span></h2>
      <ul>
        <li>
          <dl><dt>MICRO WEB.</dt><dd>Ideafestival</dd></dl>
        </li>
        <li>
          <dl><dt>PC WEB.</dt><dd>Audio-technica</dd></dl>
        </li>
        <li>
          <dl><dt>MOBILE UI.</dt><dd>Shopick</dd></dl>
        </li>
        <li>
          <dl><dt>MOBILE UI.</dt><dd>Brothumb<i>!</i></dd></dl>
        </li>
      </ul>
      <a href="#contents" class="scroll">scroll</a>
    </div>
  </section>
  <section id="contents">
    <div class="wrap">
      <div class="imgSlider">
        <div class="nav"><p class="title">전경이미지</p><p class="num"><span class="current">1</span>/<span class="total">3</span></p></div>
        <div class="slider">
          <div><img src="./common/images/img_ideafestival01.jpg" alt="" /></div>
          <div><img src="./common/images/img_ideafestival02.jpg" alt="" /></div>
          <div><img src="./common/images/img_ideafestival03.jpg" alt="" /></div>
          <div><img src="./common/images/img_ideafestival04.jpg" alt="" /></div>
        </div>
      </div>
      <div class="title ideafestival">
        <h2>더 나은 미래를 위한 <strong>IDEAFESTIVAL</strong></h2>
        <p>SK 이노베이션이 기업을 대표하는 사회공헌 프로그램 <br />Ideafestival과 자사 홍보를 위한 <br />마이크로 웹 사이트 프로젝트를 진행했습니다.</p>
        <a href="https://ideafestival.dongri.me/" target="_blank" rel="noopener">LAUNCH PROJECT</a>
        <ul class="sliderControl">
          <li><button class="prev">prev</button></li>
          <li><button class="next">next</button></li>
        </ul>
      </div>
      <hr />
      <div class="title at">
        <h2>음악에 대한 사랑과 열정으로 <strong>AUDIO-TECHNICA</strong></h2>
        <p>일본을 대표하는 정통 오디오 명가인 audio-technica의 <br />한국어 PC·MOBILE UI WEB 컨셉 디자인 프로젝트를 진행했습니다.</p>
        <a href="https://at.dongri.me/" target="_blank" rel="noopener">LAUNCH PROJECT</a>
        <ul class="sliderControl">
          <li><button class="prev">prev</button></li>
          <li><button class="next">next</button></li>
        </ul>
      </div>
      <hr />
      <div class="title mobile shopick">
        <h2>V COMMERCE SERVICE <strong>SHOPICK</strong></h2>
        <p>SHOPICK은 SNS을 활용한 인플루언스 마케팅에 <br />착안해 비디오를 결합한 신개념 모바일 V 커머스 <br />쇼핑 플랫폼입니다.</p>
        <a href="https://portfolio.dongri.me/uix/shopick/" target="_blank" rel="noopener">LAUNCH PROJECT</a>
        <ul class="sliderControl">
          <li><button class="prev">prev</button></li>
          <li><button class="next">next</button></li>
        </ul>
      </div>
      <hr />
      <div class="title mobile brothumb">
        <h2>V COMMERCE SERVICE <strong>Brothumb<i>!</i></strong></h2>
        <p>SHOPICK은 SNS을 활용한 인플루언스 마케팅에 <br />착안해 비디오를 결합한 신개념 모바일 V 커머스 <br />쇼핑 플랫폼입니다.</p>
        <a href="https://portfolio.dongri.me/uix/shopick/" target="_blank" rel="noopener">LAUNCH PROJECT</a>
        <ul class="sliderControl">
          <li><button class="prev">prev</button></li>
          <li><button class="next">next</button></li>
        </ul>
      </div>
    </div>
  </section>
  <footer>
    <address>© Dong-gri All rights reserved.</address>
  </footer>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tiny-slider/2.9.1/min/tiny-slider.js"></script>
<script src="./common/js/scrollMonitor.js"></script>
<script src="./common/js/common.js"></script>
</html>