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HTML 

              
                <section class="mt_S">
			<h2 class="h_2">アコーディオンメニュー</h2>
			<div class="accordion accordion_qa">
				<input type="checkbox" id="check5" class="accordion-hidden">
				<label for="check5" class="accordion-open">
						<span class="Q">質問1</span>
				</label>
				<label for="check5" class="accordion-inner">
					回答が入ります
				</label>
				
				<input type="checkbox" id="check6" class="accordion-hidden">
				<label for="check6" class="accordion-open"><span class="Q">質問2</span></label>
				<label for="check6" class="accordion-inner">
					回答が入ります
				</label>
				
				<input type="checkbox" id="check7" class="accordion-hidden">
				<label for="check7" class="accordion-open"><span class="Q">遠方でも対応してもらえますか？</span></label>
				<label for="check7" class="accordion-inner">
					りんご
				</label>
				
			</div>
</section>
<!-- /Q&Aがついたアコーディオン -->
!

CSS 

              
                body {
    margin: 0;
}

section {
    width: 80%;
    margin: 0 auto;
}

/*ここから*/
.accordion {
  width: 100%;
}
  
/* inputのチェックボックスを非表示 */
.accordion-hidden {
  display: none;
}
  
/* 見出しボタン部分 */
.accordion-open {
  display: flex;
  align-items: center;
  padding: 10px 80px 10px 10px;
  cursor: pointer;
  margin: 5px 0;
  position: relative;
  min-height: 5rem;
}
  
/* ＋アイコン */
.accordion-open::before,
.accordion-open::after {
  content: '';
  width: 20px;
  height: 2px;
  background: #CBD100;
  position: absolute;
  top: 50%;
  right: 5%;
  transform: translateY(-50%);
}
  
/* アイコンのー */
.accordion-open::after {
  transform: translateY(-50%)
    rotate(90deg);
  transition: .5s;
}
  
/* アコーディオンが開いたらーに */
.accordion-hidden:checked+.accordion-open:after {
  transform: translateY(-50%) rotate(0);
}
  
/* アコーディオン中身部分 */
.accordion-inner {
  display: block;
  height: 0;
  overflow: hidden;
  padding: 0;
  opacity: 0;
  transition: 0.5s;
  /* 表示速度の設定 */
  cursor: pointer;
}

/* チェックボックスにチェックが入ったら中身部分を表示する */
.accordion-hidden:checked+.accordion-open+.accordion-inner {
  height: auto;
  opacity: 1;
  padding: 10px;
}
/* ↑ここまで共通 */
  
  
/* Q&A追加 */
.accordion_qa .Q {
  position: relative;
}
  
.accordion_qa .Q::before {
  content: 'Q.';
  font-size: 1.6em;
  color: #CBD100;
}
  
.accordion_qa .accordion-open {
  padding-left: 2.5em;
}
  
.accordion_qa .accordion-hidden:checked+.accordion-open+.accordion-inner {
  height: auto;
  opacity: 1;
  padding: 10px 10px 10px 4.5em;
}
/* Q&A追加ここまで */
!

JS
!
999px

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