.how { 
  margin: 0 30px 0 30px;
}

.intro {
  position: relative;
  background: url('/imgs/share/sheet_big.png') no-repeat;
  background-position: bottom ; 
  color: #404040; 
  width: 830px;
  height: 232px; 
  margin: 20px 0 0 0;
}

.imgnumber {
  float: right;
  margin: 0 0 40px 50px;
}

.book {
}
.desc {
  width: 740px;
  margin: 30px 0 0 40px;
}

.fourstep {
}

.break {
  clear: both;
}

.imgtitle {
  margin: 40px 0 10px 0;
}

.leftcontainer {
  float: left;
  width: 370px;
}

.rightcontainer {
  float: right;
  width: 370px;
}

.supertitle {
  text-align: center;
  margin: 40px 0 40px 0;
}
.supertitle h1 {
  color: #405060;
  font-size: 20px;
}

.step {
  text-align: center;
  margin-bottom: 20px;
}