header{
  background: #0D1013;
  height: 70px;
}
header .logo {
  width: 1200px;
  margin: 0 auto;
}
main {
  
}

aside {
  float: left;
}
.base-info {
  width: 1200px;
  margin: 0 auto;
}
.banner {
  margin-top: 54px;
}
.book-infos {
  overflow: hidden;
  width: 1040px;
  margin: 30px auto 0 auto;
}
.book-title {
  font-size: 26px;
  line-height: 30px;
  color: #000000;
  margin-bottom: 14px;
}
.book-tag {
  background: url(../../images/library/book-tag.png) center left no-repeat;
  font-size: 20px;
  line-height: 24px;
  color: #F5A623;
  padding-left: 25px;
  margin-bottom: 14px;
  display: block;
}

.book-infos .content{
  float: left;
  margin-left: 26px;
  padding-top: 20px;
  width: 700px;
}
.book-infos dl {
  overflow: hidden;
  margin-bottom: 10px;
}
.book-infos dt {
  float: left;
  width: 80px;
  text-align: right;
  font-size: 16px;
  line-height: 18px;
  color: #989A9C;
  margin-bottom: 0 !important;
}
.book-infos dd {
  float: left;
  font-size: 16px;
  line-height: 20px;
  margin-left: 14px;
  width: 600px;
  color: #000000;
  margin-bottom: 0px !important;
}
.buy {
  display: block;
  width: 140px;
  height: 40px;
  line-height: 42px;
  text-align: center;
  background: #007AFF;
  color: #ffffff;
  text-decoration: none;
  margin-top: 35px;
}
.introduce-container {
  background: #fafafa;
  padding-top: 40px;
}
.introduce-container section {
  width: 1040px;
  margin: 0 auto;
  margin-bottom: 40px;
}
.introduce-title {
  font-size: 24px;
}
.introduce-title span {
  font-size: 16px;
  color: #CACACA;
}
.introduce-content {
  margin-top: 20px;
  border: 2px solid #E3E2E2;
  padding: 40px 50px;
}
.introduce-content p {
  font-size: 16px;
  line-height: 24px;
  color: #373737;
}
.view-more {
  float: right;
  display: none;
  font-size: 16px;
  color: #007AFF;
  background: url(../../images/library/down-arrow.png) center right no-repeat;
  padding-right: 16px;
  margin-top: 5px;
  cursor: pointer;
}
.contents {
  padding: 40px 0;
}
.contents h1,
.contents h2,
.contents p {
  padding-left: 50px;
}
.contents h1 {
  font-size: 18px;
  line-height: 42px;
}
.contents h1::before {
  content: '';
  margin-right: 10px;
  border-left: 3px solid #157efb;
}
.contents h2 {
  font-size: 18px;
  line-height: 42px;
  background-color: #f2f2f2;
}
.contents h2::before {
  content: '';
  width: 4px;
  height: 4px;
  background: #157efb;
  float: left;
  border-radius: 200px;
  position: relative;
  top: 20px;
  margin-right: 10px;
}
.contents p {
  font-size: 16px;
  line-height: 42px;
  color: #494949;
  padding-left: 64px;
}
.more-contents {
  height: 63px;
  border: 2px solid #E3E2E2;
  border-top: none;
  text-align: center;
  line-height: 64px;
  display: none;
}
.more-contents a {
  background: url(../../images/library/down-arrow.png) center right no-repeat;
  padding-right: 16px;
  text-decoration: none;
  color: #1b82fa;
}
.more-contents .expanded,
.expanded {
  background: url(../../images/library/up-arrow.png) center right no-repeat;
}
footer {
  height: 120px;
  background: #0D1013;
}