@media (max-width: 768px) .wrapper width: 100%; padding: 10px; .postbit float: none; width: 100%; .navigation, .breadcrumb font-size: 14px; .quick_login input, .search input width: 100%;

Replace or modify the default MyBB theme with a fully responsive one.

<button id="mobile-menu-btn">☰</button> <div id="mobile-nav"> <ul> <li><a href="index.php">Home</a></li> <li><a href="search.php">Search</a></li> <li><a href="memberlist.php">Members</a></li> </ul> </div> <script> document.getElementById('mobile-menu-btn').onclick = function() document.getElementById('mobile-nav').classList.toggle('open'); ; </script> Increase tap target sizes and improve touch interactions.