#page_layout {
  min-width: 40em;
  width: 90%;
  max-width: 65em;
  margin: 0 auto;
}

#page_layout:after {
  content: "."; 
  display: block; 
  height: 0; 
  clear: both; 
  visibility: hidden;
}

#head {
  position: relative;
  min-height: 220px;
  margin: 0;
}

.gallery #head {
  min-height: 145px;
}

#content {
  float: left;
  width: 59%;
  min-height: 40em;
}

#sidebar {
  float: right;
  width: 36%;
}

#foot {
  float: right;
  width: 36%;
}