JSFiddle - React, Tailwind, and code Playground

HTML

<section class="faq">
  <h1 class="title">FAQ</h1>
  <ul>
    <li>
      <div class="question">如何辦理退換貨？</div>
      <div class="answer">請參考退貨服務頁面。</div>
    </li>
    <li>
      <div class="question">退款方式及退款時間？</div>
      <div class="answer">約7-8個工作天完成退款作業。</div>
    </li>
    <li>
      <div class="question">未退回的退款，是否可直接折抵新訂單？</div>
      <div class="answer">很抱歉，重新訂購時無法直接於新訂單扣抵。</div>
    </li>
    <li>
      <div class="question">發票遺失是否仍能辦理退換貨？</div>
      <div class="answer">很抱歉，需要有發票才能辦理退換貨。</div>
    </li>
    <li>
      <div class="question">什麼情況無法辦理退換貨？</div>
      <div class="answer">超過7天退貨期限，就無法辦理。</div>
    </li>
  </ul>
</section>

SCSS

* {
  box-sizing: border-box;
}

.title {
  font-size: 36px;
  text-align: center;
  padding: 20px 0;
  border-bottom: 1px solid #000;
  margin-bottom: 20px;
  font-weight: bold;
}

li {
  max-width: 550px;
  margin: 0 auto;
  font-size: 24px;
  
  & + & {
    margin-top: 20px;
  }
    
  .question {
    padding: 0 50px 0 10px;
    position: relative;
    color: #4fbe84;
    cursor: pointer;
    
    &:hover {
      background-color: #eafff4;
    }
    
    &::before {
      content: 'Q: ';
      font-weight: bold;
    }
    
    &::after {
      content: '+';
      position: absolute;
      top: -5px;
      right: 10px;
      font-size: 36px;
      width: fit-content;
      transform: rotate(0deg);
      transition: 0.5s linear;
    }
  }
  
  .answer {
    height: 0;
    overflow: hidden;
    background-color: #eafff4;
    padding: 0 10px;
    visibility: hidden;

    
    &::before {
      content: 'A: ';
      font-weight: bold;
    }
  }
  
  &.open .question{
    background-color: #eafff4;
    
    &::after {
      transform: rotate(405deg);
    }
  }
}

.slide-down {
  animation: slide-down 0.3s linear both;
}

.slide-up {
  animation: slide-up 0.3s linear both;
}

@keyframes slide-down {
  0% {
    visibility: hidden;
    height: 0;
  }

  95% {
    visibility: visible;
    height: 2rem;
  }
  
  100% {
    visibility: visible;
    height: auto;
  }
}

@keyframes slide-up {
  from {
    visibility: visible;
    height: 2rem;
  }

  to {
    visibility: hidden;
    height: 0;
  }
}

JavaScript

const questions = document.querySelectorAll('.question');

function toggleOpen() {
	const list = event.target.closest('li');
  const answer = list.querySelector('.answer');
	if (list.className.includes('open')) {
  	answer.classList.remove('slide-down');
    answer.classList.add('slide-up');
    list.classList.remove('open');
  } else {
    answer.classList.remove('slide-up');
    answer.classList.add('slide-down');
    list.classList.add('open');
  }
}

for (let question of questions) {
	question.onclick = toggleOpen;
}