语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/Date/setTime.html

@@ -4,7 +4,7 @@
 <div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/date-settime.html" width="100%"></iframe></div>
 <p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
 <h2 id="Syntax" name="Syntax">语法</h2>
-<pre class="syntaxbox"><var>dateObj</var>.setTime(<em>timeValue</em>)</pre>
+<pre><code class="language-javascript"><var>dateObj</var>.setTime(<em>timeValue</em>)</code></pre>
 <h3 id="Parameters" name="Parameters">参数</h3>
 <dl>
 <dt><code>timeValue</code></dt>
@@ -17,7 +17,7 @@
 <pre>theBigDay = new Date("July 1, 1999");
 sameAsBigDay = new Date();
 sameAsBigDay.setTime(theBigDay.getTime());
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>