File Content: navbar.php <nav class="navbar navbar-expand-lg " style="background:linear-gradient(to right,rgba(0,0,0,0.3),rgba(0,0,0,0.3));"> <div class="container-fluid"> <button type="button" id="sidebarCollapse" class="btn btn-dark"> <i class="fas fa-align-left"></i> <span>menu</span> </button> <button class="btn btn-dark d-inline-block d-lg-none ml-auto" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"> <i class="fas fa-align-justify"></i> </button> <div class="collapse navbar-collapse" id="navbarSupportedContent"> <ul class="nav navbar-nav"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <li class="nav-item active "> <a class="nav-link text-white" href="view_about.php">About</a> </li> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <li class="nav-item"> <a class="nav-link text-white" href="view_contact.php">Contact</a> </li> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <li class="nav-item"> <a class="nav-link text-white" href="view_pro.php">Product</a> </li> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <li class="nav-item"> <a class="nav-link text-white" href="inquery.php">Enquiry</a> </li> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </ul> <ul class="nav navbar-nav ml-auto"> <li class="nav-item text-right"> <a class="nav-link text-white" href="logout.php?log">logout</a> </li> </ul> </div> </div> </nav> Submit