html {
      width: 100%;
      height: 100%;
      margin-top: 0px;
      margin-left: 0px;
      /*\*/
      overflow: auto;
      /**/
}

body {
      text-align: center;
      background-color: #fff;
}

#main {
      width: 900px;
      height: 600px;
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: -300px;
      margin-left: -450px;
      text-align: center;
}