Не работает overflow: scroll;?

<div class="help-tap__table">
                                    <table>
                                        <tr>
                                            <td class="td1">Дата</td>
                                            <td class="td2">Пробег, км</td>
                                            <td class="td3">Доп расходы, руб</td>
                                            <td class="td4">Комментарий</td>
                                        </tr>
                                        <tr>
                                            <td>27.12.16</td>
                                            <td>83600 <span>(89234)</span></td>
                                            <td>12389</td>
                                            <td>Покупка колодок и замена их</td>
                                        </tr>
                                        <tr>
                                            <td>26.12.16</td>
                                            <td>82600 <span>(89234)</span></td>
                                            <td></td>
                                            <td></td>
                                        </tr>
                                        <tr>
                                            <td>25.12.16</td>
                                            <td>81830 <span>(89234)</span></td>
                                            <td></td>
                                            <td></td>
                                        </tr>
                                        <tr>
                                            <td>24.12.16</td>
                                            <td>83600 <span>(89234)</span></td>
                                            <td></td>
                                            <td></td>
                                        </tr>
                                        <tr>
                                            <td>23.12.16</td>
                                            <td>83600 <span>(89234)</span></td>
                                            <td></td>
                                            <td></td>
                                        </tr>
                                        <tr>
                                            <td>22.12.16</td>
                                            <td>83600 <span>(89234)</span></td>
                                            <td></td>
                                            <td></td>
                                        </tr>
                                    </table>
                                </div>

.help-tap__table {
   height: 100%;
   width: 800px !important;
   overflow-x: auto;
tr {
   width: 100%;
}
table {
   border-radius: 5px;
   border-collapse: collapse;
   border: solid 1px #bcbcbc;
   width: 100%;
}
td {
   padding: 10px 15px;
   border: solid 1px #bcbcbc;
   height: 100%;
}
td span {
   color: #ad0b0a;
}
}