Tạo lớp đẩy điều hướng

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☰ open

<style> body { font-family: "Lato", sans-serif; } .sidenav { height: 100%; width: 0; position: fixed; z-index: 1; top: 0; left: 0; background-color: #111; overflow-x: hidden; transition: 0.5s; padding-top: 60px; } .sidenav a { padding: 8px 8px 8px 32px; text-decoration: none; font-size: 20px; color: #0000ff; display: block; transition: 0.3s; } .sidenav a:hover { color: #f1f1f1; } .sidenav .closebtn { position: absolute; top: 0; right: 25px; font-size: 36px; margin-left: 5px; } #main { transition: margin-left .5s; padding: 16px; } @media screen and (max-height: 450px) { .sidenav {padding-top: 15px;} .sidenav a {font-size: 18px;} } </style> <div id="mySidenav" class="sidenav"> <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a> <a href="#">link111</a> <a href="#">link222</a> <a href="#">link333</a> <a href="#">link444</a> </div> <div id="main"> <h2>1111111111111111111111</h2> <p>2222222222222222222222222222222222222222</p> <span style="font-size:30px;cursor:pointer" onclick="openNav()">☰ open</span> </div> <script> function openNav() { document.getElementById("mySidenav").style.width = "250px"; document.getElementById("main").style.marginLeft = "250px"; } function closeNav() { document.getElementById("mySidenav").style.width = "0"; document.getElementById("main").style.marginLeft= "0"; } </script>