body {
  margin: 0;
  padding: 0;
}

#top {
  margin: 20px;
  padding:10px;
  background: #cccccc;
  height: 100px;
}

#wrapper {
  margin: 0 10px;
  padding: 0;
}

#left {
  float: left;
  width: 200px;
}

#right {
  float: right;
  width: 200px;
}  

#center {
  margin-right: 210px;
  margin-left: 210px;
  background: #cccccc;
}

#clear {
  clear: both;
}

#footer {
  background: #cccccc;
  margin: 20px;
  text-align: center;
}