<div>
  <nav>
    <div class="nav-wrapper">
      <ul id="nav-mobile" class="left">
        <li><a router-link="registration">Registration</a></li>
        <li><a router-link="list"><i class="material-icons">view_module</i></a></li>
        <li><a router-link="search"><i class="material-icons">search</i></a></li>
      </ul>
    </div>
  </nav>
  <div>
    <router-outlet></router-outlet>
  </div>
</div>

<div>
  <nav>
    <div class="nav-wrapper">
      <ul id="nav-mobile" class="left">
        <li><a router-link="registration">Registration</a></li>
        <li><a router-link="list"><i class="material-icons">view_module</i></a></li>
        <li><a router-link="search"><i class="material-icons">search</i></a></li>
      </ul>
    </div>
  </nav>
  <div class="container">
    <router-outlet></router-outlet>
  </div>
</div>

Put container in router outlet div
Put container in router outlet div
