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HTML 

              
                <!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Cresta.design</title>
  <link rel="stylesheet" href="./css/reset.css">
  <link href="https://fonts.googleapis.com/css?family=Noto+Sans+JP|Roboto&display=swap" rel="stylesheet">
  <link rel="stylesheet" href="./css/style.css">
</head>
<body>
  <!-- header -->
  <header class="header">
    <h1 class="site-title"><a href="./">クリ★スタ</a></h1>
    <div class="nav-wrapper">
      <nav class="header-nav">
        <ul class="nav-list">
          <li class="nav-item"><a href="#about">About</a></li>
          <li class="nav-item"><a href="#blog">News</a></li>
          <li class="nav-item"><a href="#access">Access</a></li>
        </ul>
      </nav>
	</div>
	<button class="burger-btn">
		<span class="bars">
		  <span class="bar bar_top"></span>
		  <span class="bar bar_mid"></span>
		  <span class="bar bar_bottom"></span>
		</span>
	</button>
  </header>
  <!-- //header -->

  <!-- main -->
  <main>
			<!-- fv -->
			<div class="fv">
			<p class="main-copy">Cresta.Design</p>
			</div>
			<!-- //fv -->

    <!-- about -->
    <section class="section-wrapper" id="about">
	  <h2 class="section-title">About</h2>
	  	<h3 class="about-title">ミニマルで<br>洗練されたデザインを。</h3>
	  	<p class="text_about">近年、ミニマルなデザインが流行しています。そこで弊社では、クライアント企業様新規サービス等の課題に対してミニマルで洗練されたデザインを実現させることで解決のサポートを致します。もちろん全てのサービスにおいてミニマルなデザインが課題解決になるわけではないので、課題や今後のサービスの展開等しっかりとヒアリングを行なった上でご提案させて頂きます。
			</p>
    </section>
	<!-- //about -->
	
	 <!--service -->
   <section class="section-wrapper" id="service">
			<h2 class="section-title">Service</h2>
			<div class="content-inner">
				<div class="text-wrapper_service">
					<h3 class="service-title">リリース時のサポートで<br>サービスのブランディングを</h3>
					<p class="section-text_service">
						弊社では、リリース時もサポートさせて頂きます。プレスリリース用のサイトや動画制作を通して、サービスのブランディングを行わせて頂きます。
					</p>
				</div>	
				<div class="img-wrapper_service">
					<img src="https://drive.google.com/uc?export=view&id=16l_4EvoVBKm1Vu8WesRIgisMZfCKjJZY" alt="黒い布の上に置かれた黒い一眼レフカメラ">
				</div>
			</div>
			<div class="content-inner reverse">
				<div class="text-wrapper_service">
					<h3 class="service-title">リリース後のサポートで<br>効果を最大化させる</h3>
					<p class="section-text_service">
						弊社では、リリース後もサポートさせて頂きます。サービスはリリース後に様々な課題にぶつかります。そこでクライアント様と一緒に改善を行うことで、デザインの効果を最大化させます。
					</p>
				</div>
				<div class="img-wrapper_service">
					<img src="https://drive.google.com/uc?export=view&id=1Uif2Ch2m5pnIUuTWqEiZUCVe1qwu4UXG" alt="黒い布の上に置かれた黒いアイフォン">
				</div>
			</div>
		</div>
	</section>
	<!-- //service -->
	
	<!-- News -->
	<section class="section-wrapper" id="blog">
			<div class="section-inner">
				<h2 class="section-title">NEWS</h2>
				<ul class="card-list">
					<li class="card-item">
						<a href="#!">
							<div class="card-img">
								<img src="https://drive.google.com/uc?export=view&id=1_QC1qlYK_8IbZgQojdrvL0esg1sqQVfI" alt="黒い背景にあるPC">
							</div>
							<p class="text_news">新規サイトを公開しました。今回のサイトは白と黒を基調にしたミニマルなデザインになっています。</p>
						</a>
					</li>
					<li class="card-item">
						<a href="#!">
							<div class="card-img">
								<img src="https://drive.google.com/uc?export=view&id=1_QC1qlYK_8IbZgQojdrvL0esg1sqQVfI" alt="黒い背景にあるPC">
							</div>
							<p class="text_news">新規サイトを公開しました。今回のサイトは白と黒を基調にしたミニマルなデザインになっています。</p>
						</a>
					</li>
					<li class="card-item">
						<a href="#!">
							<div class="card-img">
								<img src="https://drive.google.com/uc?export=view&id=1_QC1qlYK_8IbZgQojdrvL0esg1sqQVfI" alt="黒い背景にあるPC">
							</div>
							<p class="text_news">新規サイトを公開しました。今回のサイトは白と黒を基調にしたミニマルなデザインになっています。</p>
						</a>
					</li>
				</ul>
			</div>
		</section>
		<!-- //News -->

    <!-- Contact -->
    <section class="section-wrapper">
      <h2 class="section-title">Contact</h2>
      <form action="" class="form">
				<div class="form-part">
					<label for="input-name">担当者名</label>
					<input type="text" id="input-subject">
				</div>
				<div class="form-part">
						<label for="input-tel">電話番号</label>
						<input type="text" id="input-subject">
				</div>
				<div class="form-part">
						<label for="input-mail">メールアドレス</label>
						<input type="text" id="input-subject">
				</div>
				<div class="form-part">
						<label for="detail">お問い合わせ内容</label>
						<textarea name="" type="text" id="detail" cols="30" rows="10"></textarea>
				</div>
				<div class="form-send">
						<input type="submit" value="送信" class="form-btn">
				</div>				
			</form>
    </section>
    <!-- //Contact -->
  </main>
  <!-- //main -->
  <!-- footer -->
  <footer class="footer">
    <small>©︎crest.design all rights reserved</small>
  </footer>
  <!-- //footer -->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="./js/script.js"></script>
</body>
</html>
!

CSS 

              
                /* rset.css */

/**
 * YUI 3.5.0 - reset.css (http://developer.yahoo.com/yui/3/cssreset/)
 * http://cssreset.com
 * Copyright 2012 Yahoo! Inc. All rights reserved.
 * http://yuilibrary.com/license/
 */
/*
	TODO will need to remove settings on HTML since we can't namespace it.
	TODO with the prefix, should I group by selector or property for weight savings?
*/
html{
	color:#000;
	background:#FFF;
}
/*
	TODO remove settings on BODY since we can't namespace it.
*/
/*
	TODO test putting a class on HEAD.
		- Fails on FF.
*/
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;
}
/*
	TODO think about hanlding inheritence differently, maybe letting IE6 fail a bit...
*/
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;
}
/* to preserve line-height and selector appearance */
sup {
	vertical-align:text-top;
}
sub {
	vertical-align:text-bottom;
}
input,
textarea,
select {
	font-family:inherit;
	font-size:inherit;
	font-weight:inherit;
}
/*to enable resizing for IE*/
input,
textarea,
select {
	*font-size:100%;
}
/*because legend doesn't inherit in IE */
legend {
	color:#000;
}
/* YUI CSS Detection Stamp */
#yui3-css-stamp.cssreset { display: none; }


/* style.css */

/* ------------------ */
/* base */
/* ------------------ */
html{
	font-size: 62.5%;
}
body{
	color:#141414;
	font-size:1.4rem;
	line-height:1.8;
	letter-spacing: 0.05em;
	
	font-family: 'Roboto', sans-serif,'Noto Sans JP', sans-serif;
}
.noscroll{
	overflow: hidden;
  }
img{
	width:100%;
	vertical-align: bottom;
}
a{
	text-decoration: none;
	color:#fff;
}
.section-title{
	font-size: 3.6rem;
	font-weight: bold;
	text-align: center;
	letter-spacing: 0.05em;
	margin-bottom: 70px;
}
h3{
	font-size: 2.4rem;
	font-weight: bold;
	line-height:2;
	letter-spacing: 0.1em;
	margin-bottom: 40px;
}
.section-wrapper{
	padding:100px 10% 50px;	
	
}
/* ------------------ */
/* header */
/* ------------------ */
.header{
	background-color: #1B1310;
	color: #fff;
	height:74px;
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 0 120px;
	border-bottom:1px solid #fff;
}
.nav-list{
	/* navの横並び */
	display: flex;
}
.nav-item{
	/* メニューの右側に余白 */
	margin-right: 55px;
}
.burger-btn{
	display: none;
}
/* ------------------ */
/* fv */
/* ------------------ */
.fv{
	/* 画面の高さの90に指定 */
	height:90vh;
	/* 背景画像の設定 */
	background-image: url(https://drive.google.com/uc?export=view&id=1KiBAmJAbba1BglsHGnlKWEKzj6wCL9kq);
	background-size: cover;
	background-position: center;
	/* メインコピーの上下左右中央寄せ */
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
}
.main-copy{
	 font-size: 5rem;
	 color: #fff;
	 font-weight: bold;
	 border:2px solid #fff;
	 padding: 34px 42px;
}

/* ------------------ */
/* about */
/* ------------------ */

/* ------------------ */
/* service */
/* ------------------ */
.text-wrapper_service,.img-wrapper_service{
	max-width: 480px;
}
.content-inner{
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
}
.reverse{
	margin-top: 50px;
	flex-direction: row-reverse;
}

/* ------------------ */
/* news */
/* ------------------ */
.card-list{
	display: flex;
	justify-content: space-between;
	align-items: center;
}
.card-item{
	max-width: 320px;
	box-shadow: 0px 0px 6px rgba(27, 19, 16, 0.4);
  margin-right:10px;
}
.text_news{
	color:#141414;
	padding: 33px 25px;
}

/* ------------------ */
/* contact */
/* ------------------ */
.form{
	max-width: 700px;
	margin: 0 auto;
}
input,textarea{
	border: 1px solid #141414;
	padding: 10px;
}
.form-part{
	display: flex;
	flex-direction: column;
	margin-top: 25px;
}
label{
	margin-bottom: 5px;
}
#input-subject,textarea{
	line-height: 2;
	font-size: 1.6rem;
}
textarea{
	resize: none;
	height: 171px;
}
.form-send{
	text-align: center;
	margin-top: 50px;
}
.form-btn{
	display: inline-block;
	width: 235px;
	padding: 20px 97px;
	border-radius: 30px;
	font-size: 2rem;
	font-weight: bold;
	text-align: center;
	color: #fff;
	background-color: #1B1310;
	box-shadow: 0px 0px 6px #1B1310;
}

/* ------------------ */
/* footer */
/* ------------------ */
footer{
	background-color: #1B1310;
	height: 80px;
}
small{
	display: block;
	text-align: center;
	color: #fff;
	padding-top: 30px;
}

@media screen and (max-width:768px){
/* ----------------------- */
/* base_sp
/* ----------------------- */

h3{
	font-size: 2rem;
	margin-bottom: 30px;
}
.section-wrapper{
	padding:100px 5% 50px;	
}
/* ------------------ */
/* humberger-menu */
/* ------------------ */
.header{
	padding: 0 5%;
}
.burger-btn{
	display: block;
	width: 39px;
	height: 39px;
	position: relative;
	z-index: 3;
/*   codepenの挙動のため */
  background-color:transparent;
  border:none;
  }
  .bar{
	width: 20px;
	height: 1px;
	display: block;
	position: absolute;
	left: 50%;
	transform: translateX(-50%);
	background-color: #fff;
  }
  .bar_top{
	top: 10px;
  }
  .bar_mid{
	top: 50%;
	transform: translate(-50%,-50%);
  }
  .bar_bottom{
	bottom: 10px;
  }
  .burger-btn.close .bar_top{
	transform: translate(-50%,10px) rotate(45deg);
	transition: transform .3s;
  }
  .burger-btn.close .bar_mid{
	opacity: 0;
	transition: opacity .3s;
  }
  .burger-btn.close .bar_bottom{
	transform: translate(-50%,-8px) rotate(-45deg);
	transition: transform .3s;
  }
  .nav-wrapper{
	display: none;
	width: 100vw;
	height: 100vh;
	position: fixed;
	top: 0;
	left: 0;
	z-index: 2;/*キービジュアルと.btn_triggerとの重なりの前後関係を調整*/
   }
   .header-nav{
	  width: 100%;
	  height: 100%;
	  background-color:#1B1310;
	  z-index: 2;
	}
   .header-nav .nav-list{
	  display: block;
	  position: absolute;
	  top: 50%;
	  left: 50%;
	  transform: translate(-50%,-50%);
	  text-align: center;
	}
	.header-nav .nav-item{
	  margin-right: 0;
	  margin-bottom: 40px;
	}

/* ------------------ */
/* fv */
/* ------------------ */
.main-copy{
	font-size: 3rem;
}

/* ------------------ */
/* service */
/* ------------------ */
 .content-inner{
  flex-direction:column;
	margin:50px auto;
}
.img-wrapper_service{
	margin-top: 40px;
}
.img-wrapper_service img{
  height:150px;
  object-fit:cover;
}
 
/* ------------------ */
/* news */
/* ------------------ */
.card-list{
	flex-direction: column;
}
.card-item{
	margin: 50px 0 0;
}
}
.card-list li:first-child{
	margin-top: 0;
}
}
!

JS 

              
                $('.burger-btn').on('click',function(){//.btn_triggerをクリックすると
    $('.burger-btn').toggleClass('close');//.btn_triggerにcloseクラスを付与(ボタンのアニメーション)
    $('.nav-wrapper').fadeToggle(500);//.nav-wrapperが0.5秒でフェードイン(メニューのフェードイン)
    $('body').toggleClass('noscroll');//bodyにnoscrollクラスを付与(スクロールを固定)
   });

   if( $(window).width() < 768 ){//デバイスの幅が768以下のとき
    $('.nav-item>a').on('click',function(){//.nav-item>aをクリックすると
      $('.nav-wrapper').fadeOut(500);//.nav-wrapperが0.5秒でフェードアウト(メニューのフェードアウト)
      $('.burger-btn').removeClass('close');//.btn_triggerのcloseクラスを削除
      $('body').removeClass('noscroll');//bodyのnoscrollクラスを削除
    });
  }
!
999px

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