#head {
  border: 1px black solid;
  text-align: center;
}

#left {
  border: 1px red solid;
  float: left;
  width: 20%;
  padding-left: .5em;
}

#center {
  border: 1px blue solid;
  float: left;
  width: 60%;
  padding-left: .5em;
}

#right {
  border: 1px green solid;
  float: left;
  width: 15%;
  padding-left: .5em;
}

#footer {
  border: 1px purple solid;
  float: left;
  width: 100%;
  clear: both;
  text-align: center;
}