Using CSS, how to I change the vertical order of div blocks?
<p>I've got a header/logo with div blocks on the right and left:</p>

<p><div class="snippet" data-lang="js" data-hide="false">
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<pre class="snippet-code-css lang-css prettyprint-override"><code>  .wrap .title-area {
    position: absolute;
    top: 0;
    width: 100%
  }</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="wrap"&gt;
  &lt;div class="header-left-box"&gt;
    &lt;p&gt;abcd-left box&lt;/p&gt;
  &lt;/div&gt;
  &lt;div class="title-area"&gt;
    &lt;p&gt;abcd-header&lt;/p&gt;
  &lt;/div&gt;
  &lt;div class="header-right-box"&gt;
    &lt;p&gt;abcd right box&lt;/p&gt;
  &lt;/div&gt;
&lt;/div&gt;</code></pre>
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</div>
</p>

<p>I styled it with 30%, 40%, 30% width and each has float:left to give the results I need. On reduced screen size, I give each div box 100% width so they stack. But because I want the logo box at the top, I give the style.</p>

<p>That brings the header to the top but the header-left-box also stays at the top, under the header. How can I arrange those as needed without them overlapping?</p>