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HTML

              
                <div class="container">
  <header class="header">
    <h1 id="title" class="text-center">アンケート</h1>
    <p id="description" class="description text-center">
      ご協力ありがとうございます。
    </p>
  </header>
  <form id="survey-form">
    <div class="form-group">
      <label id="name-label" for="name">氏名</label>
      <input
        type="text"
        name="name"
        id="name"
        class="form-control"
        placeholder="おなまえ たろう"
        required
      />
    </div>
    <div class="form-group">
      <label id="email-label" for="email">メール</label>
      <input
        type="email"
        name="email"
        id="email"
        class="form-control"
        placeholder="***@***.mail.com"
        required
      />
    </div>
    <div class="form-group">
      <label id="number-label" for="number"
        >年齢<span class="clue">(任意)</span></label
      >
      <input
        type="number"
        name="age"
        id="number"
        min="10"
        max="99"
        class="form-control"
        placeholder="18"
      />
    </div>
    <div class="form-group">
      <p>習熟度</p>
      <select id="dropdown" name="role" class="form-control" required>
        <option disabled selected value>習熟度を選んでください</option>
        <option value="student">学生</option>
        <option value="job">職業</option>
        <option value="learner">学習中</option>
        <option value="preferNo">ひみつ</option>
        <option value="other">その他</option>
      </select>
    </div>

    <div class="form-group">
      <p>友人にオススメできますか?</p>
      <label>
        <input
          name="user-recommend"
          value="definitely"
          type="radio"
          class="input-radio"
          checked
        />はい</label
      >
      <label>
        <input
          name="user-recommend"
          value="maybe"
          type="radio"
          class="input-radio"
        />たぶん</label
      >

      <label
        ><input
          name="user-recommend"
          value="not-sure"
          type="radio"
          class="input-radio"
        />いいえ</label
      >
    </div>

    <div class="form-group">
      <p>
        本サイトで気に入ったものはなんですか?
      </p>
      <select id="most-like" name="mostLike" class="form-control" required>
        <option disabled selected value>選択肢から選んでください</option>
        <option value="challenges">チャレンジ</option>
        <option value="projects">プロジェクト</option>
        <option value="community">コミュニティ</option>
        <option value="openSource">Oオープンソース</option>
      </select>
    </div>

    <div class="form-group">
      <p>
        改善が必要なところはどこだと思いますか?
        <span class="clue">(当てはまるものすべて)</span>
      </p>

      <label
        ><input
          name="prefer"
          value="front-end-projects"
          type="checkbox"
          class="input-checkbox"
        />フロントエンドプロジェクト</label
      >
      <label>
        <input
          name="prefer"
          value="back-end-projects"
          type="checkbox"
          class="input-checkbox"
        />バックエンドプロジェクト</label
      >
      <label
        ><input
          name="prefer"
          value="data-visualization"
          type="checkbox"
          class="input-checkbox"
        />データビジュアライゼーション</label
      >
      <label
        ><input
          name="prefer"
          value="challenges"
          type="checkbox"
          class="input-checkbox"
        />チャレンジ</label
      >
      <label
        ><input
          name="prefer"
          value="open-source-community"
          type="checkbox"
          class="input-checkbox"
        />オープンソースコミュニティ</label
      >
      <label
        ><input
          name="prefer"
          value="gitter-help-rooms"
          type="checkbox"
          class="input-checkbox"
        />ヘルプルーム</label
      >
      <label
        ><input
          name="prefer"
          value="videos"
          type="checkbox"
          class="input-checkbox"
        />動画</label
      >
      <label
        ><input
          name="prefer"
          value="city-meetups"
          type="checkbox"
          class="input-checkbox"
        />ミートアップ</label
      >
      <label
        ><input
          name="prefer"
          value="wiki"
          type="checkbox"
          class="input-checkbox"
        />Wiki</label
      >
      <label
        ><input
          name="prefer"
          value="forum"
          type="checkbox"
          class="input-checkbox"
        />フォーラム</label
      >
      <label
        ><input
          name="prefer"
          value="additional-courses"
          type="checkbox"
          class="input-checkbox"
        />追加コース</label
      >
    </div>

    <div class="form-group">
      <p>その他になにかあればコメントお願いします。</p>
      <textarea
        id="comments"
        class="input-textarea"
        name="comment"
        placeholder="コメントを入力してください"
      ></textarea>
    </div>

    <div class="form-group">
      <button type="submit" id="submit" class="submit-button">
        送信
      </button>
    </div>
  </form>
</div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Kosugi+Maru&display=swap');

:root {
  --color-white: #f3f3f3;
  --color-yellow: #F0E30E;
  --color-darkblue-alpha: rgba(27,3,4, 0.6);
  --color-brown: #110205;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: 'Kosugi Maru';
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-white);
  margin: 0;
  &::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    z-index: -1;
    background: var(--color-yellow);
    background-image: linear-gradient(
        180deg,
        rgba(242,229,16, 0.8),
        rgba(182,59,0, 0.7)
      ),
      url('https://i.imgur.com/yBoW0DB.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;    
  }
}

@mixin textLayout {
  margin-top: 0;
  margin-bottom: 0.5rem; 
}

h1 {
  @include textLayout;
  font-weight: 400;
  line-height: 1.2;
}

p {
  @include textLayout;
  font-size: 1.125rem;
}

label {
  display: flex;
  align-items: center;
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

input,
button,
select,
textarea {
  margin: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

button {
  border: none;
}

.container {
  width: 100%;
  margin: 3.125rem auto 0 auto;
}

@media (min-width: 576px) {
  .container {
    max-width: 540px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}

.header {
  color: black;
  padding: 0 0.625rem;
  margin-bottom: 1.875rem;
}


.description {
  font-style: italic;
  font-weight: 200;
  text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.4);
}

.clue {
  margin-left: 0.25rem;
  font-size: 0.9rem;
  color: #e4e4e4;
}

.text-center {
  text-align: center;
}

form {
  background: var(--color-darkblue-alpha);
  padding: 2.5rem 0.625rem;
  border-radius: 0.25rem;
}

@media (min-width: 480px) {
  form {
    padding: 2.5rem;
  }
}

.form-group {
  margin: 0 auto 1.25rem auto;
  padding: 0.25rem;
}

.form-control {
  display: block;
  width: 100%;
  height: 2.375rem;
  padding: 0.375rem 0.75rem;
  color: #495057;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
  border-color: #80bdff;
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.input-radio,
.input-checkbox {
  display: inline-block;
  margin-right: 0.625rem;
  min-height: 1.25rem;
  min-width: 1.25rem;
}

.input-textarea {
  min-height: 120px;
  width: 100%;
  padding: 0.625rem;
  resize: vertical;
}

.submit-button {
  display: block;
  width: 100%;
  padding: 0.75rem;
  background: var(--color-brown);
  color: inherit;
  border-radius: 2px;
  cursor: pointer;
}

              
            
!

JS

              
                const projectName = 'survey-form';
              
            
!
999px

Console