pre.screen {
  background-color: #FFFF99 ;
  border: 1px solid #006600 ;
}

div.note, div.tip, div.warning {
  margin-top: 5px;
  margin-bottom: 5px;
  padding: 5px;
}

div.note, div.tip {
  border-left: solid palegreen 20px;
}

div.warning {
  border-left: solid red 20px;
}