html, body {
  margin: 0;
  padding: 0;
  background-color: #ccc;
}

#content {
  background-color: red;
  width: 80%;
  min-height: 200px;
  height: 100%;
  float: left;
}

#content > iframe {
  background-color: white;
  border: 0;
  width: 100%;
  height: 100%;
}

#toolbar {
  background-color: green;
  width: 20%;
  min-height: 200px;
  float: right;
}