/*原子类*/
.wrapper:before,
.wrapper:after,
.clearfix:before,
.clearfix:after {
  display: table;
  content: "";
}
.wrapper:after,
.clearfix:after {
  clear: both;
}
.wrapper,
.clearfix {
  zoom: 1;
}

.Left {
  float: left;
}

.Right {
  float: right;
}


.contain {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.fixWidth {
  width: 90%;
  margin: 0 auto;
  position: relative;
}

.contain .demo div {
  display: block;
  width: 100%;
  height: 40px;
  border-radius: 5px;
  border: 1px solid #999;
  margin-bottom: 20px;
  text-align: center;
  font-size: 14px;
  line-height: 40px;
}

.whiteBG {
  background: white;
}
.fullHeight {
  height: 100%;
}
.guideView:before {
  display: none;
}
.center {
  text-align: center;
}
.blue {
  color: #1e83d3;
}

/* --------- nav ------------*/
.nav {
  width: 100%;
  max-width: 640px;
  text-align: left;
  line-height: 45px;
  padding: 25px 0 35px;
}

.nav h1 {
  font-size: 2.5em;
  font-weight: bold;
}