.row {
  margin-left: -20px;
  *zoom: 1;
}
.row:before, .row:after {
  display: table;
  content: "";
}
.row:after {
  clear: both;
}
[class*="span"] {
  float: left;
  margin-left: 20px;
}
.span1 {
  width: 60px;
}
.span2 {
  width: 140px;
}
.span3 {
  width: 220px;
}
.span4 {
  width: 300px;
}
.span5 {
  width: 380px;
}
.span6 {
  width: 460px;
}
.span7 {
  width: 540px;
}
.span8 {
  width: 620px;
}
.span9 {
  width: 700px;
}
.span10 {
  width: 780px;
}
.span11 {
  width: 860px;
}
.span12, .container {
  width: 940px;
}
.offset1 {
  margin-left: 100px;
}
.offset2 {
  margin-left: 180px;
}
.offset3 {
  margin-left: 260px;
}
.offset4 {
  margin-left: 340px;
}
.offset5 {
  margin-left: 420px;
}
.offset6 {
  margin-left: 500px;
}
.offset7 {
  margin-left: 580px;
}
.offset8 {
  margin-left: 660px;
}
.offset9 {
  margin-left: 740px;
}
.offset10 {
  margin-left: 820px;
}
.offset11 {
  margin-left: 900px;
}