.container {
  margin: 0 auto;
  width: 960px;
}
.no-sidebars .main,
.no-sidebars .page-content {
  width: 960px;
}
.sidebar-first .page-content {
  float: right;
  width: 670px;
}
.sidebar-second .main,
.sidebar-second .page-content {
  float: left;
  width: 670px;
}
.two-sidebars .main {
  float: left;
  width: 720px;
}
.two-sidebars .page-content {
  float: right;
  width: 480px;
}
.two-sidebars .first-sidebar {
  float: left;
  width: 240px;
}
.two-sidebars .second-sidebar {
  float: right;
  width: 240px;
}
.one-sidebar .first-sidebar {
  float: left;
  width: 290px;
}
.one-sidebar .second-sidebar {
  float: right;
  width: 290px;
}
/**
 * column gutters
 */
.sidebar-first .page-content .gutter {
  padding-left: 12px;
}
.sidebar-second .page-content .gutter {
  padding-right: 11px;
}
.two-sidebars .page-content .gutter {
  padding-left: 8px;
  padding-right: 7px;
}
.sidebar .gutter {
  padding: 0 7px 7px;
}
/**
 * preface and bottom regions
 */
.preface-1,
.bottom-1 {
  width: 960px;
}
.preface-2,
.bottom-2 {
  float: left;
  width: 480px;
}
.preface-3,
.bottom-3 {
  float: left;
  width: 320px;
}
.bottom-4 {
  float: left;
  width: 240px;
}
.preface .gutter,
.bottom .gutter {
  padding: 0 10px 5px;
}