div.email {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.95em;
  background-color: #f0f0f0;
  margin: 5px 0px;
  line-height: 110%;
  padding: 5px;
  overflow: auto;
  height: auto;
  border: 1px solid;
  text-align: left;
}

div.email div.email {
  font-size: 0.95em;
  color: darkblue;
}

div.email div.email div.email {
  font-size: 1em;
  color: darkgreen;
}

div.email div.email div.email div.email {
  color: darkred;
}

div.email div.email div.email div.email div.email {
  color: darkcyan;
}