CSS Problem: Fixes Menu lässt sich mobil nicht scrollen

Diesmal geht es um ein CSS Dropdown Menu. Es funktioniert soweit auch ganz gut. Es muss noch ein bisschen angepasst werden. Allerdings habe ich das Problem, wenn man mobil das Menu aufruft, dass man dann nicht runter scrollen kann, wenn man das Dropdown Menu anklickt.
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<!-- <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Montserrat"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> --> <style> body,h1,h2,h3,h4,h5,h6 {font-family: "Lato", sans-serif} .w3-bar,h1,button {font-family: "Montserrat", sans-serif} .fa-anchor,.fa-coffee {font-size:200px} body { margin:0; font-family:Arial; height:2000px; } .topnav { overflow: hidden; background-color: #6a5a4a; } .topnav a { float: left; display: block; color: #f2f2f2; text-align: center; padding: 14px 36px; text-decoration: none; font-size: 17px; } .active { background-color: #4CAF50; color: white; } .topnav .icon { display: none; } .dropdown { float: left; overflow: hidden; } .dropdown .dropbtn { font-size: 16px; border: none; outline: none; color: white; padding: 14px 16px; background-color: inherit; font: inherit; margin: 0; } .navbar a:hover, .dropdown:hover .dropbtn { background-color: #6a5a4b; } .dropdown-content a { color: black; } .dropdown-content { display: none; position: absolute; background-color: #dddddd; width: 100%; left: 0; box-shadow: 0px 18px 26px 0px rgba(0,0,0,0.2); z-index: 1; border: 1px solid white; } .dropdown-content .header { background: red; padding: 16px; color: white; } .dropdown:hover .dropdown-content { display: block; } @media screen and (max-width: 800px) { .topnav a:not(:first-child), .dropdown .dropbtn { display: none; } .topnav a.icon { float: right; display: block; } } @media screen and (max-width: 800px) { .topnav.responsive {position: relative;} .topnav.responsive .icon { position: absolute; right: 0; top: 0; } .w3-content{ overflow-Y:scroll; height:auto; width:calc(100% + 15px); max-height:400px; } .topnav.responsive a { float: none; display: block; text-align: left; } .topnav.responsive .dropdown {float: none;} .topnav.responsive .dropdown-content {position: relative;} .topnav.responsive .dropdown .dropbtn { display: block; width: 100%; text-align: left; } @media screen and (max-width: 800px) { .column { width: 100%; height: auto; } } } </style> <body> <!-- Navbar --> <div class="w3-top"> <div class="w3-bar w3-red w3-card w3-left-align w3-large"> <div class="topnav" id="myTopnav"> <div class="w3-content"> <a href="#home">Menu 1</a> <div class="dropdown"> <button class="dropbtn">Dropdown <i class="fa fa-caret-down"></i> </button> <div class="dropdown-content"> <div class="row"> <div class="column"> <a href="#">Link 1</a> <a href="#">Link 2</a> <a href="#">Link 3</a> <a href="#">Link 4</a> <a href="#">Link 5</a> <a href="#">Link 6</a> <a href="#">Link 7</a> <a href="#">Link 8</a> <a href="#">Link 9</a> <a href="#">Link 10</a> <a href="#">Link 11</a> <a href="#">Link 12</a> </div> </div> </div> </div> <a href="#home">Menu 2</a> <a href="#home">Menu 3</a> <a href="#contact">Menu 4</a> <a href="#about">Menu 5</a> <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">☰</a> </div> </div> </div> </div> <br><br><br> Hier kommt der Inhalt <main> </main> <script> function myFunction() { var x = document.getElementById("myTopnav"); if (x.className === "topnav") { x.className += " responsive"; } else { x.className = "topnav"; } } </script> </body>