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HTML

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<form action="post">
  <button type="button" id="entry_conf" class="a-btn b-blu big_btn modal-open">内容確認</button>

  <div class="modal-container">
    <div class="modal-body">
      <div class="modal-close modal-button">×</div>
      <div class="modal-content">
        <h2>送信内容の確認</h2>
        <table class="form-table small mb-1">
          <tbody>
            <tr>
              <th>お名前</th>
              <td>確認　太郎</td>
            </tr>
            <tr>
              <th>メールアドレス</th>
              <td>sample@sample.com</td>
            </tr>
            <tr>
              <th>電話番号</th>
              <td>000-0000-0000</td>
            </tr>
          </tbody>
        </table>

        <div class="d-flex space-around">
          <button type="button" class="a-btn b-grn-rv middle_btn modal-close">戻る</button>
          <button type="button" id="entry_send" class="a-btn b-blu middle_btn">送信</button>
        </div>
      </div>
    </div>
  </div>
</form>
!

CSS 

              
                .modal-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    background: rgba(0, 0, 0, 50%);
    padding: 40px 20px;
    overflow: auto;
    opacity: 0;
    visibility: hidden;
    transition: .3s;
    box-sizing: border-box;
    z-index: 999999;
  }

  .modal-container.active {
    opacity: 1;
    visibility: visible;
  }

  .modal-body {
    position: relative;
    display: inline-block;
    vertical-align: middle;
    max-width: 700px;
    width: 90%;
  }

  .modal-button {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    top: -40px;
    right: -40px;
    width: 40px;
    height: 40px;
    font-size: 40px;
    color: #fff;
    cursor: pointer;
  }

  .modal-content {
    background: #fff;
    text-align: left;
    padding: 30px;
    overflow: auto;
    max-height: 700px;
  }


  .a-btn.middle_btn {
    padding: 16px 4vw;
    font-size: 1.2rem;
    margin: 20px auto;
  }

  .a-btn {
    display: inline-block;
    width: auto;
    padding: 8px 5vw;
    text-decoration: none;
    transition: color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out;
  }

  .b-grn-rv {
    background-color: white;
    color: #52AB84;
    border: #52AB84 3px solid;
  }

  .b-grn-rv:hover {
    background-color: #52AB84;
    color: white;
    border: #52AB84 3px solid;
  }

  .b-blu {
    background-color: #416FAC;
    color: white;
    border: #416FAC 3px solid;
  }

  .b-blu:hover {
    background-color: white;
    color: #416FAC;
    border: #416FAC 3px solid;
  }

  .d-flex {
    display: flex;
    flex-wrap: wrap;
  }

  .space-around {
    justify-content: space-around;
  }

  .form-table tr:nth-child(odd) {
    background-color: #f7f7f7;
  }

  .form-table tr th,
  .form-table tr td {
    padding: 25px;
    vertical-align: middle;
  }

  .form-table {
    table-layout: fixed;
    width: 100%;
  }

  .form-table tr th {
    width: 30%;
    text-align: left;
  }

  .form-table tr td {
    width: 70%;
  }

  .form-table tr th label {
    font-weight: bold;
  }
!

JS 

              
                $(document).ready(function () {

    var close = $('.modal-close'),
      container = $('.modal-container');

    var error = "";
    $('#entry_conf').click(function () {
      if (error != "") {
        return false;
      } else {
        container.addClass('active');
        $('#entry_send').attr("type", "submit");
        return false;
      }
    });

    close.on('click', function () {
      container.removeClass('active');
    });

    $(document).on('click', function (e) {
      if (!$(e.target).closest('.modal-body').length) {
        container.removeClass('active');
      }
    });

  });
!
999px

Console