title: How to set vertical-align of span to middle of a div
body: <p>I test vertical-align with a simple html code, but it doesn't work</p>
  
  <pre><code>&lt;div style="height:45px; border: solid 1px black;"&gt;
      &lt;strong style="vertical-align:bottom;"&gt;
          abc
      &lt;/strong&gt;
  &lt;/div&gt;
  </code></pre>