title: How to change the style of alert box?
body: <p>I need to change the style of the "OK" Button in an <em>alert</em> box.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;head&gt;
      &lt;script type="text/javascript"&gt;
          function show_alert() {
              alert("Hello! I am an alert box!");
          }
      &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;input type="button" onclick="show_alert()" value="Show alert box" /&gt;
  &lt;/body&gt;</code></pre>
  </div>
  </div>
  </p>