p#myFirst {
  border: 1px solid orange;
}

p#mySecond {
  border: 1px solid blue;
}
  
/* type of media */

@media screen
{
  p#myFirst {
    width: 65cm;
  }
}

@media handheld
{
  p#mySecond {
    width: 35cm;
  }
}