nav.php

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="index.php">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="products.php">Trees</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="garden-products.php">Related Products</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="products.php">Contact Us</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="products.php">Locations</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="products.php">Help</a>
      </li>
    </ul>
    <form action="searchshop.php" method="POST" class="form-inline my-2 my-lg-0">
		<input class="form-control mr-sm-2" type="search" placeholder="Search for a product" aria-label="Search for a product" name="search">
		<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
	</form>
    <div class="cart form-inline my-2 my-lg-0 text-right p-3">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item">
        <a href="cart.php"><i class="fas fa-shopping-cart fa-2x"></i> <span class="sr-only">(current)</span></a>
      </li>

      </ul>
      </div>
  </div>

</nav>