body {
  text-align:center;
}

#wrapper {
  width:800px;
  margin:auto;
}

#header {
  height: 100px;
  witdth:800px;
  border: thick dotted #FF0000;
}

#navigation {
  float:left;
  width:180px;
  border: thick dotted #00FF00;
}

#content {
  float:left;
  width:600px;
  border: thick dotted #0000FF;
}

h1 {
  color:red;
}