JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <input class="input" type="text" placeholder="請輸入姓名">
  
  <select class="clothes-style">
    <option value="" selected disabled>款式</option>
    <option value="man">男裝</option>    
    <option value="woman">女裝</option>
  </select>
  
  <select class="clothes-type">
    <option value="" selected disabled>類型</option>
    <option value="coat">外套</option>
    <option value="Jacket">上衣</option>
    <option value="Pants">下身</option>
  </select>
  
  <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>顧客姓名： <span class="custom-name"></span></li>
    <li>服裝分類： <span class="clothing-style"></span></li>
    <li>服裝類型： <span class="clothing-type"></span></li>
    <li>初步估價： <span class="inital-valuation"></span></li>
  </ul>

</div>

SCSS

.container {
  width: fit-content;
  margin: 50px auto;
}

.input, select {
  outline: none;
  border: none;
  font-size: 24px;
  background-color: #aaa;
  color: #fff;
  border-radius: 8px;
  padding: 5px;
  font-weight: bold;
  width: 100%;
}

select {
  margin-top: 10px;
}

.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;
  width: 100%;
  padding: 10px;
  display: flex;
  justify-content: space-between;
}

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

.lists {
  background-color: #ccc;
  border-radius: 8px;
  padding-bottom: 20px;
  
  li + li {
    margin-top: 10px;
  }
  
  .title {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    border-bottom: 1px solid #000;
    padding: 8px 0;
  }
  
  li:not(:nth-child(1)) {
    font-size: 18px;
    font-weight: 400;
    display: flex;
    justify-content: space-around;   
    
  }
}

JavaScript

const input = document.querySelector('.input');
const clothesStyle = document.querySelector('.clothes-style');
const clothesType = document.querySelector('.clothes-type');

function show() {
  let sellMessage = '';
  let name = input.value;
  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！`;
  let valuation = 0;

  let styleIndex = clothesStyle.selectedIndex;
  let styleText = clothesStyle.options[styleIndex].text;
  let styleValue = clothesStyle.options[styleIndex].value;

  let typeIndex = clothesType.selectedIndex;
  let typeText = clothesType.options[typeIndex].text;
  let typeValue = clothesType.options[typeIndex].value;

  if (name.trim() === '') return alert('請輸入姓名');
  if (styleValue === '') return alert('請選擇款式');
  if (typeValue === '') return alert('請選擇類型');

  if (styleValue === 'man') {
    sellMessage = '最近剛好是工廠週年慶，只要您今天來電下單，我們將贈送您帥氣領帶！';
    valuation = 600;
  } else {
    sellMessage = '最近剛好是工廠週年慶，只要您今天來電下單，我們將贈送您美麗圍巾！';
    valuation = 500;
  }

  alert(message);
  alert(sellMessage);

  document.querySelector('.custom-name').textContent = name;
  document.querySelector('.clothing-style').textContent = styleText;
  document.querySelector('.clothing-type').textContent = typeText;
  document.querySelector('.inital-valuation').textContent = valuation;

  document.querySelector('.input').value = '';
  document.querySelector('.clothes-style').value = '';
  document.querySelector('.clothes-type').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);
};