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HTML 

              
                <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Lovecode_Form 作業</title>
    <link rel="stylesheet" href="reset.css" />
    <link rel="stylesheet" href="form.css" />
    <link
      href="https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css"
      rel="stylesheet"
    />
  </head>
  <body>
    <div class="nav">
      <img src="https://picsum.photos/100/40/?random=10" />
    </div>
    <div class="wrap">
      <div class="aside">
        <ul>
          <li>
            <a href=""><i class="bx bx-home"></i>Dashboard</a>
          </li>
          <li>
            <a href="" class="active"><i class="bx bxs-cuboid"></i>Products</a>
          </li>
          <li>
            <a href=""><i class="bx bxs-report"></i>Reports</a>
          </li>
          <li>
            <a href=""><i class="bx bx-folder"></i>Documents</a>
          </li>
        </ul>
      </div>
      <div class="container">
        <div class="title">
          <div class="path">
            <ul>
              <li><a href="">Dashboard</a></li>
              <li><a href="">Products</a></li>
              <li><a href="">New Product</a></li>
            </ul>
          </div>
        </div>
        <form action="/add-product" class="form">
          <div class="form-title">
            <h2>New Product</h2>
          </div>
          <div class="box nametext">
            <label for="name" class="label" name="productname">商品名稱</label>
            <input
              type="text"
              id="name"
              placeholder="e.g.ABC Shoes"
              autofocus
            />
          </div>
          <div class="box typeselect">
            <label for="choice" class="label">商品種類</label>
            <select id="choice" name="choice" aria-placeholder="Select">
              <option value="jac">上衣</option>
              <option value="coat">外套</option>
              <option value="pant">褲子</option>
              <option value="acc">配件</option>
            </select>
          </div>
          <div class="box skutext">
            <label for="sku" class="label">SKU</label>
            <input type="text" id="sku" valeu="sku" placeholder="e.g.ABC-123" />
          </div>
          <div class="box typeradio">
            <p class="label">商品類別</p>
            <input type="radio" name="sex" value="male" class="sex" />男裝
            <input type="radio" name="sex" value="female" class="sex" />女裝
          </div>
          <div class="box pritext">
            <label for="pri" class="label">商品單價(NTD)</label>
            <input type="number" id="pri" value="pri" placeholder="$1,000" />
          </div>
          <div class="box check">
            <div class="item">
              <input
                type="checkbox"
                class="checkbox"
                name="return"
                value="return"
              />可退貨
            </div>
            <div class="item">
              <input
                type="checkbox"
                class="checkbox"
                name="delivery"
                value="delivery"
              />免運
            </div>
          </div>
          <div class="box profile">
            <label for="file" class="label">上傳商品圖</label>
            <input type="file" id="file" name="profile" />
          </div>
          <div class="button-group">
            <input type="button" class="backbut" name="backbut" value="返回" />
            <input type="submit" class="button" name="submit" value="新增" />
          </div>
        </form>
      </div>
    </div>
  </body>
</html>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@100;300;400;500;700&display=swap");
* {
  margin: 0;
  padding: 0;
  list-style: none;
  box-sizing: border-box;
}
body {
  font-family: "Noto Sans TC", sans-serif;
  background-color: #eee;
  color: #566b7a;
}
.nav {
  height: 60px;
  background-color: #fff;
  border-bottom: 1px solid #aaa;
  width: 100%;
}
.nav img {
  display: inline-block;
  vertical-align: middle;
  padding: 10px 30px;
}
.wrap {
  width: 1400px;
  display: flex;
}
.aside {
  height: 100vh;
  width: 15%;
  box-shadow: 10px 0 50px #dbdbdb;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.aside ul {
  padding: 20px 0;
}
.aside .bx {
  padding: 0 10px 0;
}
.aside li a {
  text-decoration: none;
  line-height: 2.5rem;
  color: #566b7a;
  font-weight: 500;
}
.aside .active {
  color: #fb834c;
}
.aside li a:hover:not(.active) {
  color: #fb834c;
}
.title {
  padding: 20px;
}
.title ul {
  display: flex;
  padding: 20px;
}
.title li a {
  text-decoration: none;
  color: #566b7a;
  font-size: 13px;
  padding: 0 10px;
}
.title li a:hover {
  color: #fb834c;
}
.title li + li::before {
  content: "/";
  color: #566b7a;
  font-size: 13px;
}
.form {
  margin: 0 50px;
  background-color: #fff;
  border: 1px solid #fff;
  border-radius: 10px;
  font-family: "Noto Sans TC", sans-serif;
  width: 100vh;
}
.form-title {
  display: flex;
  justify-content: space-between;
  height: 60px;
  border-bottom: 1px solid #eee;
  margin: 10px;
}

.form-title h2 {
  font-weight: 700;
  padding-left: 10px;
  line-height: 60px;
}
.button-group {
  padding: 0 10px;
  margin: 10px;
}
.backbut {
  display: inline-block;
  line-height: 40px;
  width: 80px;
  height: 40px;
  text-align: center;
  color: #fff;
  border: 2px solid #aaa;
  border-radius: 4px;
  background-color: #aaa;
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 500;
}
.button {
  display: inline-block;
  line-height: 40px;
  width: 120px;
  height: 40px;
  text-align: center;
  color: #fff;
  border: 2px solid #fb834c;
  border-radius: 4px;
  background-color: #fb834c;
  font-family: "Noto Sans TC", sans-serif;
  font-weight: 500;
  margin: 10px;
}
.box {
  padding: 10px 0;
}
.nametext {
  display: flex;
  flex-direction: column;
}
.label {
  padding: 10px;
}
.nametext #name,
#choice,
#sku,
#pri {
  padding: 10px;
  margin-left: 10px;
  border-radius: 10px;
  border: 1px solid #eee;
  background-color: #fff;
  width: 300px;
}
.typeselect {
  display: flex;
  flex-direction: column;
}
.skutext {
  display: flex;
  flex-direction: column;
}
.sex {
  margin: 10px;
  padding: 10px;
}
.pritext {
  display: flex;
  flex-direction: column;
}
.check {
  margin: 20px 0 20px 0;
  display: flex;
}
.checkbox {
  margin: 10px;
}
.check .item {
  padding: 0 10px;
}
!

JS
!
999px

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