My website is no hyperlinking to an internal HTML page, i am using href for the portfolio

This is the website:https://digitalxu.com/ Everything else works but the portfolio hyperlink.

<div class="dropdown">
                <div class="container">
                    <div class="dropdown_inner">
                        <ul>
                            <li><a href="#home">Home</a></li>
                            <li><a href="#about">About</a></li>
                            <li><a href="#services">Services</a></li>
                            <li><a href="banners.html" target="_blank" >Portfolio</a> 
                            </li>
                            
                            <li><a href="#contact">Contact</a></li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>