.clearfix {
  zoom: 1;
}
.clearfix:before,
.clearfix:after {
  content: "";
  display: table;
}
.clearfix:after {
  clear: both;
}
#tube_introduction {
  background-image: url('/img/oritest/tube/tube_introduction_bg.jpg');
  background-position: left top;
  background-repeat: no-repeat;
  height: 548px;
}
#tube_introduction .span12 {
  padding-top: 50px;
  padding-left: 600px;
}
#tube_introduction h1 {
  font-size: 36px;
  font-weight: bold;
  margin-bottom: 20px;
}
#tube_introduction h2 {
  font-size: 28px;
  font-weight: bold;
  margin-bottom: 15px;
}
#tube_introduction p {
  line-height: 1.6;
  margin-bottom: 10px;
  max-width: 400px;
}