body{font-family:Arial;margin:0}.navbar{background:#111;color:#fff;padding:10px 20px;display:flex;justify-content:space-between}.container{padding:20px}.header{display:flex;justify-content:space-between;margin-bottom:15px}table{width:100%;border-collapse:collapse}td,th{border:1px solid #ddd;padding:8px}button,.btn{padding:6px 10px;margin-left:5px;cursor:pointer}