body {
  font-family: Verdana, Arial, Helvetica, sans-serif;
  font-size: 90%;
}

#container {
  width: 50em;
  margin: 1em auto;
  border: 1px solid red;
}

header {
  margin: .5em 0;
  background-color: rgb(220,220,250);
}

#leftcol {
  float: left;
  width: 12em;
  padding: .5em;
}

#rightcol {
  float: right;
  width: 10em;
  padding: .5em;
}

#centercol {
  margin-left: 13em;
  margin-right: 16em;
  background-color: rgb(204,204,204);
  padding: .5em;
}

#centercol p {
  color: blue;
}

footer {
  clear: both;
  text-align: center;
  margin: 1em 0;
  background-color: rgb(204,204,204);
}