.book-pic {
  width: 100%;
  margin-top: 21px;
  margin-bottom: 15px;
  position: relative;
}
.book-pic img {
  width: 87%;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
}
.down-bottom {
  height: 311px;
  position: absolute;
  bottom: 0;
  right: 0;
  left: 0;
  width: 100%;
  background: url('../img/appxiazai_bj@2x.png') no-repeat;
  background-size: 100%;
  background-position-y: bottom;
}
.down-bottom .download-log {
  display: block;
  margin: 0 auto;
  width: 60px;
  height: 60px;
}
.down-bottom .download-name {
  text-align: center;
  font-size: 14px;
  font-family: PingFangSC-Semibold, PingFang SC;
  font-weight: 600;
  color: #ffffff;
  margin-top: 5px;
  margin-bottom: 25px;
}
.down-bottom .download-version {
  margin: 0 auto;
  width: 200px;
  height: 45px;
  background: #ffffff;
  border-radius: 23px;
}
.down-bottom .download-version img {
  width: 24px;
  height: 24px;
  margin-left: 24px;
  margin-right: 9px;
}
.down-bottom .download-version .version {
  font-size: 16px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #ff9b00;
}
.download-exam {
  margin: 0 auto;
  width: 150px;
  height: 29px;
  margin-top: 25px;
  background: url('../img/xiazai_biaotixiahuaxian@2x.png') no-repeat;
  background-size: 100%;
}
.download-exam p {
  font-size: 12px;
  font-family: PingFangSC-Semibold, PingFang SC;
  font-weight: 600;
  color: #ffffff;
  padding-left: 25px;
  line-height: 29px;
}