.sidebartop{ top:0px; position:fixed; z-index:0; width:000%; margin:0px; padding:00px; box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; height:000px;  background-color:#abab00; } </style></head><body> <div class="sidebartop"></div><div class="sidebar"></div> </body></html>  