body {
  background-color: #f5f5f5;
}

/* 内容 */
.article {
  margin: 50px auto;
  padding-bottom: 60px;
  background-color: #fff;
}

.article .navd {
  height: 50px;
  border-bottom: 1px solid #e5e5e5;
  line-height: 50px;
}

.article .navd a:nth-child(1) {
  margin-left: 30px;
}

.article .navd a:hover {
  color: #fd6350;
}

/* 文章内容 */
.article h1 {
  margin-top: 40px;
  color: #222;
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  line-height: 32px;
}

.article .tit {
  margin: 40px auto;
  font-size: 14px;
  color: #999;
  text-align: center;
}

.article .line {
  border-bottom: 1px solid #e5e5e5;
}

.article .box {
  margin: 40px auto;
  width: 1090px;
}

.article .box p {
  margin-top: 18px;
  line-height: 32px;
  text-indent: 2em;
}

.article .box h3 {
  margin-top: 37px;
  font-size: 18px;
  font-weight: 700;
}

.article .box img {
  display: block;
  margin: 25px auto;

}