JSFiddle - React, Tailwind, and code Playground

HTML

<label class="input-text">Name: <input class="input" type="text" placeholder="請輸入姓名"></label>
<div class="btn">
  <button class="show" onclick=show()>我要訂購</button>
  <button class="about" onclick=about()>認識工廠</button>
</div>

<ul class="lists">
  <li class="title">您的訂單</li>
  <li class="name">顧客姓名: <span class="custom-name"></span></li>
</ul>

SCSS

* {
  list-style: none;
  padding: 0;
}

.input-text {
  margin-bottom: 10px;
  font-size: 24px;
}

.input {
  outline: none;
  border: none;
  font-size: 24px;
  background-color: #aaa;
  color: #fff;
  border-radius: 8px;
  padding: 5px;
  font-weight: bold;
}

.input::placeholder {
  color: #fff;
}

.show, .about {
  padding: 10px;
  display: inline-block;
  border: 0;
  background-color: #fa0;
  font-size: 24px;
  color: blue;
  font-weight: bold;
  border-radius: 10px;
  box-shadow: 5px 5px 5px #ccc;
  cursor: pointer;
}

.btn {
  margin-top: 20px;
}

button + button {
  margin-left: 10px;
}

.show:hover, .about:hover {
  transform: scale(1.2);
  color: white;
  background-color: #aaa;
}

.lists {
  background-color: #ccc;
  width: 300px;
  height: 300px;
  
  li + li {
    margin-top: 10px;
  }
  
  .title {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    border-bottom: 1px solid #000;
    padding: 8px 0;
  }
  
  .name {
    font-size: 18px;
    font-weight: 400;
    display: flex;
    justify-content: space-evenly;
    
    
    .custom-name {
      font-size: 18px;
    }
    
  }
}

JavaScript

function show() {	
	let name = document.querySelector('.input').value;
  if(name.trim() === '') return alert('請輸入姓名');
	const message = `${name}您好，謝謝您對我們的衣服有興趣！請致電 0987-654-321，會有專人提供您報價！`;
	alert(message);
  document.querySelector('.custom-name').textContent = name
  document.querySelector('.input').value = '';
};

function about() {
	const message = `我們工廠位於新北市，通過國際 ISO9001 認證，品質讓您放心！`;
	alert(message);
};