@media (max-width: 979px) {
  #wpadminbar { border-left:10px solid red !important; }
  #wrapper { padding:2%; }
}
@media (max-width: 767px) {
  #wpadminbar { border-left:10px solid green !important; }
}
@media (max-width: 480px) {
  #wpadminbar { border-left:10px solid yellow !important; }
  .left, .sidebar {
    width:100%;
    clear:both;
  }
}