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{% assign current = page.url | downcase | split: '/' %}

<nav>
  <ul>
    <li><a href='/about' {% if current[1] == 'about' %}class='current'{% endif %}>about</a></li>
    <li><a href='/blog' {% if current[1] == 'blog' %}class='current'{% endif %}>blog</a></li>
    <li><a href='/contact' {% if current[1] == 'contact' %}class='current'{% endif %}>contact</a></li>
  </ul>
</nav>