<!DOCTYPE html>
<style>
  li { list-style-image: url('data:image/png;base64, \
    iVBORw0KGgoAAAANSUhEUgAAAB4AAAABCAQAAABjudZnAAAAAmJLR0QA/4ePzL8AAAAJcEhZcwA \
    ACxMAAAsTAQCanBgAAAAOSURBVAjXY2T4z0A2AAA7PwEBN+ncIAAAAABJRU5ErkJggg==');
  }
</style>
<ul>
  <li>Bullet 1</li>
  <li>Bullet 2</li>
</ul>