index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.css" integrity="sha256-ECB9bbROLGm8wOoEbHcHRxlHgzGqYpDtNTgDTyDz0wg=" crossorigin="anonymous" />
  <title>每日體重</title>
</head>
<body>
  <div class="container">
    <div id="input">
      <div class="form-row">
        <nav class="navbar navbar-expand navbar-dark flex-column flex-md-row bd-navbar">
          <form id="form">
            <label class="sr-only" for="date">日期</label>
            <input type="Date" id="date">
            <label class="sr-only" for="height">身高(cm)</label>
            <input type="text" id="height">  
            <label class="sr-only" for="weight">體重(kg)</label>
            <input type="text" id="weight">
            <button id="submit">送出</button>
          </form>
        </nav>
      </div>
    </div>
    <table id="table">
      <thead>
        <tr>
          <td>日期</td>
          <td>身高(cm)</td>
          <td>體重(kg)</td>
          <td>與前一天相比</td>
          <td>兵役體位</td>
        </tr>
      </thead>
      <tbody>
      </tbody>
    </table>
  </div>
  <script src="appes6.js"></script>
  <style>
    .container {
      position: relative;
    }

    #table{
      border-collapse: collapse;
      border: 1px solid black;
      position: relative;
      left: 0;
      top: 80%;
      width: 100%;
      background-image:linear-gradient(
      to right bottom,
      #e9e6e7,
      #77777227);
    }

    th, td {
      border: 1px solid black;
      text-align: center;
    }

    #input {
      position: relative;
      top: 0%;
      background-image:linear-gradient(
      to right bottom,
      #d63083,
      #cece4827);
    }

    #submit {
      background-image: linear-gradient(
        to top,
        rgb(148, 197, 56),
        rgb(118, 165, 235)
      );
    }

    .success, .error {
      text-align: center;
    }

    .success {
      background: yellow;
    }
    
    .error {
      background: red;
    }

    label {
      width: 70px;
      display: inline-block;
      text-align: center;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      color: #8a54f0;
    }

    body {
      background-image: url(img/soldier.jpg), url(img/soldier2.jpg), url(img/weight.jpg), url(img/weight2.jpg);
      background-size: 25% 50%, 25% 50%, 25% 50%, 25% 50%;
      background-position: left top, right top, left bottom, right bottom ;
      background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
    }
  </style>
</body>
</html>