javascript - 如何垂直居中模态？

Question

我想垂直居中一个模式。我在谷歌上搜索了很多，但没有找到任何有用的东西。这是我的代码:

 function inactive(id, ths) {
   $("#confirmation").modal("show");
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="modal fade bs-example-modal-sm" id="confirmation" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel">
  <div class="modal-dialog modal-sm" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
        </button>
        <h4 class="modal-title">Are you sure you want to inactivate it?</h4>
      </div>
      <div class="modal-body">
        <div class="form-group">
          <input type="text" class="form-control" name="captcha" id="cval" placeholder="enter captcha">
        </div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">No</button>
        <button type="button" class="btn btn-primary" id="yes">Yes</button>
      </div>
    </div>
  </div>
</div>

如何垂直居中？

Answer 1

未测试，但你可以试试这个

.yourElement{
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}