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CSS Bootstrap 4 Basics (Retired) Using Bootstrap Components Building a Navbar

Why won't my ul elements line up in the nav?

<nav class="navbar fixed-top navbar-inverse bg-primary pb-4">
  <div class="container">
    <ul class="nav navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#home">Home <span class="sr-only">(current)</span></a>
      <li class="nav-item">
        <a class="nav-link" href="#about">About</a>
      <li class="nav-item">
        <a class="nav-link" href="#speakers">Speakers</a>
      <li class="nav-item">
        <a class="nav-link" href="#schedule">Schedule</a>
    <a class="navbar-brand ml-auto hidden-xs-down" href="#">Presented by Treehouse</a>

Try this replace: ```<nav class="navbar fixed-top navbar-expand navbar-inverse navbar-dark bg-primary"> <ul class="navbar-nav mr-auto"> <a class="navbar-brand hidden-xs-down" href="#">Powered by Teamtreehouse</a>