.screen_portrait {
  padding: 0;
  background: none; 
  border: 1px solid gray;
  float: none;
  clear: left;
  display: block;
  margin: 0.5em auto;
}

#header {
  margin-left: 1%;
  margin-right: 1%;
}
#content {
  padding-left: 1%;
  padding-right: 1%;
}