div.sidebar {
  position: absolute;
  top: 0px;
  left: 0px;
  width: 20%;
  max-width: 20%;
}
div.inner {
  overflow: hidden;
  margin: 3px;
  padding: 3px;
  font-size: 70%;
  border: solid 1px;
}
div.main div.body,
div.main div.error {
  margin-left: 20%;
}