title: How to assign width for <li> tag in jstree
body: <p>I am new to jstree, and i have integrated it in my project. below is my code.</p>
  
  <pre><code>&lt;div id="leaf" style"width:50px"&gt;
      &lt;ul&gt;
          &lt;li&gt;This is the first jstree leaf for testing&lt;/li&gt; 
          &lt;li&gt;this is the second jstree leaf&lt;/li&gt;
          &lt;li&gt;this is third&lt;/li&gt;
      &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I want the li's not to overlap each other, because my div width is 50px only, i know it is the CSS work, but i cant find the class.</p>