.header_banner {
  width: 100%;
  text-align: center;
  background: #091b1f;
}

.header_banner img {
  max-width: 100%;
  max-height: 400px;
}

/*侧边导航*/

.side_nav {
  width: 180px;
  border: 1px solid #eee;
  box-sizing: border-box;
  display: inline-block;
  margin-top: 20px;
  vertical-align: top;
  margin-right: 15px;
}

.side_nav .title h2 {
  font-weight: bold;
  font-size: 20px;
  border-left: 4px solid #3c6dad;
  padding-left: 10px;
}

.side_nav .title {
  padding: 34px;
  border-bottom: 1px solid #ebebeb;
}

.side_nav div a {
  display: block;
  height: 60px;
  font-size: 16px;
  line-height: 60px;
  text-align: center;
  padding-left: 15px;
}

.side_nav div a:after {
  content: "";
  display: block;
  width: 110px;
  border-bottom: 1px solid #ebebeb;
  margin-left: 20px;
}

.side_nav div a.on:after {
  border-bottom: none;
}

.side_nav div a:hover {
  text-decoration: none
}

.side_nav div a span {
  color: #888;
  margin-left: 16px;
}

.side_nav div a:hover span {
  color: #3c6dad;
}

.side_nav div a.on {
  background-color: #3c6dad;
  color: #fff;
}

.side_nav div a.on span {
  color: #fff;
}