#contentportrait{
  width:  19.9cm;
  height: 26cm;
  margin: 0px auto;
  text-align:center;
}
#contentlandscape{
  position:fixed;
  top:0px;  
  width:  27.5cm;
  height: 19cm;
  margin: 0px auto;
  text-align:center;
}

#linenumbers{
position:relative;
top:-20px;
left:-335px;
}