CSS:请问怎么让我这里的文本垂直居中？

[iMath]

Html:

   <script src="//at.alicdn.com/t/font_wucl02m681zia4i.js" type="text/javascript"></script>
    
    <div id="postMeta">
            <!-- 博文分类 -->
            <a rel="nofollow noopener" href="https://www.cnblogs.com/iMath/category/1107555.html" id="catogory">
             <svg class="icon" aria-hidden="true">
                <use xlink:href="#icon-fenlei2"></use>
             </svg>
          </a>
            <!-- 阅读统计 -->
            <div id="postViewCount">
             <svg class="icon" aria-hidden="true">
                 <use xlink:href="#icon-yuedu1"></use>
             </svg>
             <span class="post_view_count">5531</span>
             </div>
            <!-- 发布日期 -->
            <div>
                <svg class="icon" aria-hidden="true">
                <use xlink:href="#icon-history"></use>
             </svg>
                <span class="post-date">2018-06-25</span>
            </div>
            <!--  编辑 -->
            <a rel="nofollow noopener" href="https://i.cnblogs.com/EditPosts.aspx?postid=9223247">
             <svg class="icon" aria-hidden="true" id="icon-bianji">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-bianji4"></use>
             </svg>
          </a>
        </div>

CSS:

#postMeta{
  display: flex;
  justify-content: space-around;
  align-items: center;
/*   height:100px; */

}