#container { 
      margin-left: auto;
      margin-right: auto;
      left: 2%;
      right: 2%;
      max-width: 960px;
      width: 96%;
}

* html #container { 
      margin-left: -400px;
      margin-right: auto;
      left: 40%;
      right: auto;
      width: 960px;
}

*+html #container { 
      margin-left: -400px;
      margin-right: auto;
      left: 40%;
      right: auto;
      width: 960px;
}