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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">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
  <title>Document</title>
</head>
<body class="py-5">

<div class="container">
  <h1 class="h3 mb-4">Formの基本形</h1>
  <form class="mb-5">
    <div class="form-group">
      <label for="mail1">メールアドレス</label>
      <input type="email" class="form-control" id="mail1" placeholder="メールアドレス">
      <small id="emailHelp" class="form-text text-muted">私たちはあなたのメールを誰とも共有しません。</small>
    </div>
    <div class="form-group">
      <label for="password1">パスワード</label>
      <input type="password" class="form-control" id="password1" placeholder="パスワード">
    </div>
    <div class="form-group form-check">
      <input type="checkbox" class="form-check-input" id="check1">
      <label class="form-check-label" for="check1">規約に同意する</label>
    </div>
    <button type="submit" class="btn btn-primary">送信</button>
  </form>
</div>

<hr>

<div class="container">
  <h1 class="h3 mb-4">フォームのサイズを変更する</h1>

  <!-- 入力フォームのサイズ変更 -->
  <h1 class="h5 mb-4">入力フォームのサイズ変更</h1>
  <input class="form-control form-control-lg" type="text" placeholder="大きいフォーム">
  <br>
  <input class="form-control" type="text" placeholder="通常フォーム">
  <br>
  <input class="form-control form-control-sm" type="text" placeholder="小さいフォーム">

  <!-- 選択フォームのサイズ変更 -->
  <h1 class="h5 my-4">選択フォームのサイズ変更</h1>
  <select class="form-control form-control-lg">
    <option>大きい選択</option>
  </select>
  <br>
  <select class="form-control">
    <option>通常の選択</option>
  </select>
  <br>
  <select class="form-control form-control-sm">
    <option>小さい選択</option>
  </select>
</div>

<hr>

<div class="container">
  <h1 class="h3 mb-4">フォームレイアウトの作り方</h1>

  <!-- 入力フォームを2列で表示 -->
  <h1 class="h5 mb-4">入力フォームを2列で表示</h1>
  <form class="mb-5">
    <div class="form-row">
      <div class="form-group col-md-6">
        <label for="mail2">メールアドレス</label>
        <input type="email" class="form-control" id="mail2" placeholder="メールアドレス">
        <small id="emailHelp" class="form-text text-muted">私たちはあなたのメールを誰とも共有しません。</small>
      </div>
      <div class="form-group col-md-6">
        <label for="password2">パスワード</label>
        <input type="password" class="form-control" id="password2" placeholder="パスワード">
      </div>
    </div>
    <div class="form-group form-check">
      <input type="checkbox" class="form-check-input" id="check1">
      <label class="form-check-label" for="check1">規約に同意する</label>
    </div>
    <button type="submit" class="btn btn-primary">送信</button>
  </form>

  <!-- ラベルを入力フォームの横に表示 -->
  <h1 class="h5 mb-4">ラベルを入力フォームの横に表示</h1>
  <form class="mb-5">
    <div class="form-group row">
      <label for="mail3" class="col-sm-2 col-form-label">メールアドレス</label>
      <div class="col-sm-10">
        <input type="email" class="form-control" id="mail3" placeholder="メールアドレス">
      </div>
    </div>
    <div class="form-group row">
      <label for="password3" class="col-sm-2 col-form-label">パスワード</label>
      <div class="col-sm-10">
        <input type="password" class="form-control" id="password3" placeholder="パスワード">
      </div>
    </div>
  </form>
</div>

<hr>



</div>
</body>
</html>
              
            
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