Font-awesome icon cannot display

[eyanq]

It's weired that Stackoverflow and Github icon show correctly, while Instagram and Linkedin icon cannot display properly

<li class="drawer-list-item">
  <a href="/" data-pjax>
    <i class="fa fa-home"></i>Home
  </a>
</li>
<li class="drawer-list-divider"></li>
<li class="drawer-list-item drawer-list-title">
  Follow me
</li>
<li class="drawer-list-item">
    <a href="http://stackoverflow.com" target="_blank">
        <i class="fa fa-stack-overflow"></i>Stackoverflow
    </a>
</li>
<li class="drawer-list-item">
  <a href="http://github.com" target="_blank">
    <i class="fa fa-github"></i>Github
  </a>
</li>
<li class="drawer-list-item">
    <a href="http://www.instagram.com" target="_blank">
        <i class="fa-instagram"></i>Instagram
    </a>
</li>
<li class="drawer-list-item">
    <a href="http://www.linkedin.com" target="_blank">
        <i class="fa-linkedin"></i>Linkedin
    </a>
</li>

Here is my code.

[tangwz]

@yan9yu
You should edit like this:

<li class="drawer-list-item">
    <a href="http://www.instagram.com" target="_blank">
        <i class="fa fa-instagram"></i>Instagram
    </a>
</li>
<li class="drawer-list-item">
    <a href="http://www.linkedin.com" target="_blank">
        <i class="fa fa-linkedin"></i>Linkedin
    </a>
</li>