.banner {
  background: url(../images/banner2.jpg) no-repeat center;
  height: 300px;
  background-size: cover;
}
.main .box {
  padding: 40px 0 79px;
  display: flex;
  justify-content: space-between;
}
.side-nav {
  width: 250px;
  height: 300px;
  background: #f7f7f7;
}
.nav-item {
  padding: 20px 30px;
  background: #1a4eb1;
  line-height: 36px;
}
.nav-item p {
  color: #fff;
  font-family: OPPOSans;
  font-size: 27px;
}
.side-nav ul{
  padding: 10px 0 0 10px ;
}
.side-nav ul li{
  padding: 16px 0 16px 20px;
}
.side-nav ul li a{
  color:#666666;
}
.side-nav ul li.on {
  border-right: 1px solid rgba(26, 78, 177, 0.10);
  background: #1A4EB1;
  position: relative;
}
.side-nav ul li.on a{
  color: #fff;
}
.side-nav ul li.on::after{
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  width: 34px;
  height: 22px;
  background: url(../images/arrow-right.png) no-repeat center;
  background-color: #fff;
  transform: translateY(-50%);
}

.container {
  width: 910px;
}
.list-top {
  padding-bottom: 18px;
  border-bottom: 1px solid #d6e4ea;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.list-top h2 {
  font-size: 30px;
  line-height: 40px;
  font-weight: bold;
  padding-left: 40px;
  position: relative;
}
.list-top h2::after {
  content: "";
  position: absolute;
  bottom: -20px;
  left: 0;
  width: 100%;
  height: 4px;
  background: #1a4eb1;
}
.list-top p {
  font-size: 14px;
  color: #808080;
}
.list-top p a {
  color: #808080;
  margin-right: 4px;
}
.list-top p span {
  color: #1a4eb1;
  margin-left: 4px;
}

.detail-tit {
  padding: 41px 0 23px;
  border-bottom: 1px solid #d6e4ea;
  text-align: center;
}
.detail-tit h2 {
  color: #222;
  font-size: 28px;
  line-height: 37px;
  font-weight: bold;
  font-family: OPPOSans;
  margin-bottom: 15px;
}
.detail-tit p {
  color: #808080;
  font-size: 15px;
  line-height: 20px;
  font-family: OPPOSans;
}
.detail-tit span {
  margin-right: 12px;
}
.detail-nr {
  margin-top: 30px;
}
.detail-nr p {
  font-size: 17px;
  line-height: 27.2px;
  font-family: OPPOSans;
  color: #222;
}
.detail-nr h2 {
  font-size: 17px;
  line-height: 60px;
  font-family: OPPOSans;
  color: #222;
  font-weight: bold;
}
.detail-nr img {
  display: block;
  margin: 20px auto;
}