I'm going nuts a bit trying to do a website but I'm absolutely incapable of center my <nav> tag. I've read tons of threads with suggestions that involve putting in the CSS margin: 0 auto; or things like text-align: center but nothing seems to work.

I have my CSS in a separate file and so, since my CSS doesn't work at all, I'll only put the HTML here:

<nav>
    <ul class="nav nav-pills">
        <li class="active"><a href="index.html">Home</a></li>
        <li><a href="about.html">About</a></li>
        <li><a href="jobs.html">Jobs</a></li>
        <li><a href="contactus.html">Contact us</a></li>
    </ul>
</nav>

I'm using Bootstrap as you can see, and I just want to center it.