htmlはテーブルの幅が無効な問題を解決する

        <col style="width: 100px;"/>
        <col>
        <col style="width: 100px;"/>
        <col style="width: 100px;"/>
        <col style="width: 100px;"/>

.detail {
    padding-bottom: 50px;
    margin-top: 80px;
}

.detail_table {
    table-layout:fixed;/* The column width is set by the table width and column width. */
    margin: auto;/*table centered*/
    text-align: center;
    border: 1px solid #804040;
    border-collapse: collapse;
}

.detail_table th {
    padding: 26px;;
}

.detail_table td {
    border: 1px solid #804040;
    padding-top: 16px;
    padding-bottom: 16px;
}

.special {
    text-align: left;
    padding-left: 20px;
}

<div class="detail">

    <table class="detail_table">

        <thead>
        <th colspan="5">Selected options breakdown</th>
        </thead>
        <! --write it according to the width you write, but if you write a width that does not occupy the table it will be divided equally to each td in proportion to the size you give it-->
        <! -- Now write it so that the four columns are 100px, and the one that doesn't give the data accounts for all the rest -- >
        <col style="width: 100px;"/>
        <col>
        <col style="width: 100px;"/>
        <col style="width: 100px;"/>
        <col style="width: 100px;"/>

        <tbody>

        <tr>
            <td>
                Serial number
            </td>
            <td>
                Symptom
            </td>
            <td>
                Consistent with
            </td>
            <td>
                Does not meet
            </td>
            <td>
                Uncertain
            </td>
        </tr>

        <?php $i = 1; ? >

        <?php foreach ($test as $item): ? >
            <! --get selection item-->
            <?php $temp = $this->session->userdata('b' . $i) ? >

            <tr>

                <td>
                    <?php echo $i; ? >
                </td>

                <td>
                    <?php echo $item; ? >
                </td>

                <td>
                    <?php if ($temp == 1): ? >√<?php endif ? >
                </td>
                <td>
                    <?php if ($temp == 2): ? >√<?php endif ? >
                </td>

                <td>
                    <?php if ($temp == 3): ? >√<?php endif ? >
                </td>

            </tr>

            <?php $i++; ? >

        <?php endforeach; ? >

        </tbody>

    </table>

</div>