body, html {
      margin:0;
      padding:0;
}
#wrap {
      width: 100%;
      float: left;
}
#navbox {
      float:left;
      width:200px;

      background: lightblue;
      padding:10px;
}
#mainbox {
      margin-left:00px;
      margin-right:0px;
      padding:30px;
      overflow:hidden;
      background: #e0e0e0;
}