html, body {
  background-color: #f8f8f8;
}

.page-title {
  font-size: 22px;
  margin: 22px auto;
  text-align: center;
  display: block;
  line-height: 1;
}

.page-subtitle {
  font-size: 18px;
  color: #666;
  margin-left: 15px;
  margin-bottom: 5px;
}

.page-back {
  display: inline-block;
  top: 12px;
  left: 10px;
  position: absolute;
  width: 40px;
  height: 40px;
  text-align: center;
  i {
    font-size: 24px;
    line-height: 40px;
    color: #666;
  }
}