vis-time-axis .vis-text.vis-sunday {
    color: white;
  }
&lt;/style&gt;
</pre>

 <h3 id="Performance_Tips">Performance  Tips</h3>
 <p>Defining a timeline with many items and/or groups might affect initial loading time and general performance.
   Here are some tips to improve performance and avoid slow loading time:</p>
 <ul>
   <li>Define items and group with <code>DataSets</code></li>
   <li>Avoid applying heavy CSS on items (such as <code>box-shadow</code>, gradient background colors, etc.)</li>
   <li>