JSFiddle - React, Tailwind, and code Playground

HTML

<header>
  <h1>FAQ</h1>
</header>
<div class="wrap">
  <button class="question">如何辦理退換貨？ </button>
  <div class="content"> 請參考退貨服務頁面。</div>

  <button class="question">退款方式及退款時間？</button>
  <div class="content"> 約7-8個工作天完成退款作業。</div>

  <button class="question">未退回的退款，是否可直接折抵新訂單？</button>
  <div class="content">很抱歉，重新訂購時無法直接於新訂單扣抵。</div>

  <button class="question">發票遺失是否仍能辦理退換貨？</button>
  <div class="content">很抱歉，需要有發票才能辦理退換貨。</div>

  <button class="question">什麼情況無法辦理退換貨？</button>
  <div class="content">超過7天退貨期限，就無法辦理。</div>
</div>

CSS

*{
  box-sizing: border-box;
}
header{
  text-align: center;
}
.wrap{
  border-radius: 10px;
  width: 500px;
  margin: auto;
}
.question, .answer{
  background-color: #f5f5dc;
  color: #444;
  cursor: pointer;
  padding: 15px;
  margin-top: 5px;
  border: none;
  text-align: left;
  font-size: 15px;
  width: 100%;
  display: block;
  position: relative;
}
.question::before{
  content: "Q:";
  padding-right:5px;
}
.question::after{
  content:"+";
  position: absolute;
  right: 5px;
  top: 0;
  font-size: 1.5rem;
}
.question:hover{
  background-color: #ccc;
}
.answer:hover{
  background-color: #ccc;
}
.answer::after{
  content: "-";
  position: absolute;
  right: 8px;
  top: -7px;
  font-size: 2rem;
}
.content {
  width: 100%;
  padding: 0 14px;
  max-height: 0;
  overflow: hidden;
  background-color: #f1f1f1;
  transition: max-height 0.2s ease-out;
  margin: auto;
}
.content::before{
  content:"A:";
}

JavaScript

var btns=document.querySelectorAll('.question');
function open(){
  var question=event.target.closest('.question');
  var content=question.nextElementSibling;
  question.classList.toggle("answer");
  if(content.style.maxHeight==""){
    content.style.maxHeight=content.scrollHeight+'px';
  }else if(content.style.maxHeight=="0px"){
    content.style.maxHeight=content.scrollHeight+'px';
  }else{
    content.style.maxHeight="0px";
  }

}
for(var btn of btns ){
  btn.onclick=open;
}