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HTML 

              
                <div class="section s_05">

  <div class="accordion_one">
    <div class="accordion_header" id="ac1">アコーディオンの閉じるボタンを複数作る<div class="i_box"><i class="one_i"></i></div></div>
    <div class="accordion_inner">
      <div class="box_one">
        <p class="txt_a_ac">ブラウザによって閉じるボタンを押したあとの挙動が違ったので閉じた後はスクロールして上部に戻るようにしました。アコーディオンの中の内容が多いときにおすすめです。内容が少ないときは閉じるボタンは不要かなと思います。</p>
      </div>
      <div class="closeArea">
        <div class="close_box"><a href="#ac1" class="close_btn">閉じる<div class="i_box"><i class="one_i"></i></div></a></div>
      </div>
    </div>
  </div>
  
  <div class="accordion_one">
    <div class="accordion_header" id="ac2">アコーディオンの閉じるボタンを複数作る<div class="i_box"><i class="one_i"></i></div></div>
    <div class="accordion_inner">
      <div class="box_one">
        <p class="txt_a_ac">ブラウザによって閉じるボタンを押したあとの挙動が違ったので閉じた後はスクロールして上部に戻るようにしました。アコーディオンの中の内容が多いときにおすすめです。内容が少ないときは閉じるボタンは不要かなと思います。</p>
      </div>
      <div class="closeArea">
        <div class="close_box"><a href="#ac2" class="close_btn">閉じる<div class="i_box"><i class="one_i"></i></div></a></div>
      </div>
    </div>
  </div>
  
  <div class="accordion_one">
    <div class="accordion_header" id="ac3">アコーディオンの閉じるボタンを複数作る<div class="i_box"><i class="one_i"></i></div></div>
    <div class="accordion_inner">
      <div class="box_one">
        <p class="txt_a_ac">ブラウザによって閉じるボタンを押したあとの挙動が違ったので閉じた後はスクロールして上部に戻るようにしました。アコーディオンの中の内容が多いときにおすすめです。内容が少ないときは閉じるボタンは不要かなと思います。</p>
      </div>
      <div class="closeArea">
        <div class="close_box"><a href="#ac3" class="close_btn">閉じる<div class="i_box"><i class="one_i"></i></div></a></div>
      </div>
    </div>
  </div>

  <p class="_a"><a href="https://125naroom.com/web/3046" target="_blank" class="link">View the note</a></p>
</div>
!

CSS 

              
                /*====================================================================
.s_05 .accordion_one
====================================================================*/
.s_05 .accordion_one {
	max-width: 1024px;
	margin: 0 auto;
}
.s_05 .accordion_one .accordion_header {
	background-color: #db0f2f;
	color: #fff;
	font-size: 26px;
	font-weight: bold;
	padding: 20px 11%;
	text-align: center;
	position: relative;
	z-index: +1;
	cursor: pointer;
	transition-duration: 0.2s;
}
.s_05 .accordion_one:nth-of-type(2) .accordion_header {
    background-color: #ff9a05;
}
.s_05 .accordion_one:nth-of-type(3) .accordion_header {
    background-color: #1c85d8;
}
.s_05 .accordion_one .accordion_header:hover {
	opacity: .8;
}
.s_05 .accordion_one .accordion_header .i_box {
	display: flex;
	justify-content: center;
	align-items: center;
	position: absolute;
	top: 50%;
	right: 5%;
	width: 40px;
	height: 40px;
	border: 1px solid #fff;
	margin-top: -20px;
	box-sizing: border-box;
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
	transform-origin: center center;
	transition-duration: 0.2s;
}
.s_05 .accordion_one .accordion_header .i_box .one_i {
	display: block;
	width: 18px;
	height: 18px;
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
	transform-origin: center center;
	transition-duration: 0.2s;
	position: relative;
}
.s_05 .accordion_one .accordion_header.open .i_box {
	-webkit-transform: rotate(-360deg);
	transform: rotate(-360deg);
}
.s_05 .accordion_one .accordion_header .i_box .one_i:before, .s_05 .accordion_one .accordion_header .i_box .one_i:after {
	display: flex;
	content: '';
	background-color: #fff;
	border-radius: 10px;
	width: 18px;
	height: 4px;
	position: absolute;
	top: 7px;
	left: 0;
	-webkit-transform: rotate(0deg);
	transform: rotate(0deg);
	transform-origin: center center;
}
.s_05 .accordion_one .accordion_header .i_box .one_i:before {
	width: 4px;
	height: 18px;
	top: 0;
	left: 7px;
}
.s_05 .accordion_one .accordion_header.open .i_box .one_i:before {
	content: none;
}
.s_05 .accordion_one .accordion_header.open .i_box .one_i:after {
	-webkit-transform: rotate(-45deg);
	transform: rotate(-45deg);
}
.s_05 .accordion_one .accordion_inner {
	display: none;
	padding: 30px 30px;
	border-left: 2px solid #db0f2f;
	border-right: 2px solid #db0f2f;
	border-bottom: 2px solid #db0f2f;
	box-sizing: border-box;
}
.s_05 .accordion_one:nth-of-type(2) .accordion_inner {
	border-left: 2px solid #ff9a05;
	border-right: 2px solid #ff9a05;
	border-bottom: 2px solid #ff9a05;
}
.s_05 .accordion_one:nth-of-type(3) .accordion_inner {
	border-left: 2px solid #1c85d8;
	border-right: 2px solid #1c85d8;
	border-bottom: 2px solid #1c85d8;
}
.s_05 .accordion_one .accordion_inner .box_one {
	height: 300px;
}
.s_05 .accordion_one .accordion_inner p.txt_a_ac {
	margin: 0;
}
.s_05 .accordion_one .accordion_inner .closeArea {
	width: 180px;
	margin: 0 auto;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn {
	display: flex;
	justify-content: center;
	align-items: center;
	background: #db0f2f;
	padding: 15px 15px 15px 20px;
	text-decoration: none;
	line-height: 1.3;
	color: #fff;
	font-size: 18px;
	font-weight: bold;
	position: relative;
	cursor: pointer;
	transition-duration: 0.2s;
}
.s_05 .accordion_one:nth-of-type(2) .accordion_inner .closeArea .close_box a.close_btn {
    background-color: #ff9a05;
}
.s_05 .accordion_one:nth-of-type(3) .accordion_inner .closeArea .close_box a.close_btn {
    background-color: #1c85d8;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn:hover {
	opacity: .8;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn .i_box {
	display: flex;
	justify-content: center;
	align-items: center;
	position: absolute;
	top: 50%;
	left: 10%;
	width: 30px;
	height: 30px;
	margin-top: -15px;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn .i_box .one_i {
	display: flex;
	justify-content: center;
	align-items: center;
	position: relative;
	width: 18px;
	height: 18px;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn .i_box .one_i:before, .s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn .i_box .one_i:after {
	content: '';
	background-color: #fff;
	border-radius: 10px;
	width: 18px;
	height: 4px;
	position: absolute;
	top: 7px;
	left: 0;
	-webkit-transform: rotate(-45deg);
	transform: rotate(45deg);
	transform-origin: center center;
}
.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn .i_box .one_i:before {
	width: 4px;
	height: 18px;
	top: 0;
	left: 7px;
}
@media screen and (max-width: 1024px) {
	.s_05 .accordion_one .accordion_header {
		font-size: 18px;
	}
	.s_05 .accordion_one .accordion_header .i_box {
		width: 30px;
		height: 30px;
		margin-top: -15px;
	}
	.s_05 .accordion_one .accordion_inner .closeArea .close_box a.close_btn {
		font-size: 14px;
	}
}
@media screen and (max-width: 767px) {
	.s_05 .accordion_one .accordion_header {
		font-size: 16px;
		text-align: left;
		padding: 15px 60px 15px 15px;
	}
}

/*====================================================================
以下は不要です。
====================================================================*/

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;
	font-size: 16px;
	letter-spacing: .025em;
	line-height: 1.8;
	margin: 0;
}
@media screen and (max-width: 1024px) {
	body {
		font-size: 14px;
	}
}
.section {
	max-width: 1024px;
	margin: 0 auto;
	padding: 20px 20px 500px;
}
.section p._a {
	font-size: 12px;
	font-weight: bold;
	margin: 30px 0 0;
}
.section p._a .link {
	display: inline-block;
	color: #607D8B;
	padding-left: 1.3em;
	text-indent: -1.3em;
}
.section p._a .link:before {
	content: '';
	display: inline-block;
	width: 5px;
	height: 5px;
	border-top: 2px solid #607D8B;
	border-right: 2px solid #607D8B;
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
	margin-right: 10px;
}
!

JS 

              
                // .s_05 .accordion_one
$(function(){
  //.accordion_oneの中の.accordion_headerがクリックされたら
  $('.s_05 .accordion_one .accordion_header').click(function(){
    //クリックされた.accordion_oneの中の.accordion_headerに隣接する.accordion_innerが開いたり閉じたりする。
    $(this).next('.accordion_inner').slideToggle();
    $(this).toggleClass("open");
  });
  //閉じるボタンがクリックされたら
  $('a.close_btn').click(function () {
    //クリックされたa.close_btnの親要素.accordion_innerを閉じる。
    $(this).parents('.accordion_inner').slideUp();
    //クリックされたa.close_btnの親要素.accordion_innerの前要素にクラスopenがなければ追加し、あれば削除する。
    $(this).parents('.accordion_inner').prev().toggleClass("open");
  });
});

// ページ内リンク
$(function(){
  // 閉じるボタンをクリックした場合に処理
  $('.s_05 a.close_btn').click(function() {
    // 移動先を0px上にずらす
    var adjust = 0;
    // スクロールの速度
    var speed = 500; // ミリ秒
    // アンカーの値取得
    var href= $(this).attr("href");
    // 移動先を取得
    var target = $(href == "#" || href == "" ? 'html' : href);
    // 移動先を調整
    var position = target.offset().top - adjust;
    // スムーススクロール
    $('body,html').animate({scrollTop:position}, speed, 'swing');
    return false;
  });
});
!
999px

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