.sidebar{width:250px;background:#fff;padding:20px;box-shadow:2px 0 5px #0000001a;position:fixed;height:100vh;left:0;top:0;transition:transform .3s ease-in-out}.sidebar.closed{transform:translate(-100%)}.main-content{margin-left:250px;transition:margin-left .3s ease-in-out}.sidebar.closed+.main-content{margin-left:0}.menu-btn{background:none;border:none;font-size:24px;cursor:pointer;padding:10px}