.banner-img1 {
  width: 100%;
  height: 374px;
  background-image: url("/static/pc/img/djjs_bg.png");
  max-width: 2200px;
  width: 100%;
  background-size: 100%;
  margin-top: 0;
  transition: all 0.5s;
  box-sizing: border-box;
  margin: 0 auto;
  background-repeat: no-repeat;
}

.banner-img2 {
  width: 100%;
  height: 374px;
  background-image: url("/static/pc/img/banner2.png");
  max-width: 2200px;
  width: 100%;
  background-size: 100%;
  margin-top: 0;
  transition: all 0.5s;
  box-sizing: border-box;
  margin: 0 auto;
  background-repeat: no-repeat;
}

.banner-img3 {
  width: 100%;
  height: 374px;
  background-image: url("/static/pc/img/banner3.png");
  max-width: 2200px;
  width: 100%;
  background-size: 100%;
  margin-top: 0;
  transition: all 0.5s;
  box-sizing: border-box;
  margin: 0 auto;
  background-repeat: no-repeat;
}

.certification-banner {
  width: 100%;
  overflow: hidden;
}

.new-introduction-nav {
  position: fixed;
  top: 30.2%;
  z-index: 2;
  float: left;
  transition: all 0.3s;
}

.new-introduction-nav li {
  width: 220px;
  height: 60px;
  background-color: #ecf2fd;
  display: flex;
  justify-content: center;
  cursor: pointer;
  align-items: center;
  transition: all 0.3s;
}

/* 第一个li下的a标签*/
.new-introduction-nav li:nth-child(1) {
  background-color: rgba(6, 54, 126, 0.8);
}

.new-introduction-nav li:nth-child(1) a {
  color: #fff;
}

.new-introduction-nav li a:hover {
  background-color: #e0eafb;
  color: #0052d9;
}

.new-introduction-nav li a {
  display: block;
  width: 200px;
  height: 50px;
  border-radius: 8px;
  font-family: SourceHanSansSC, SourceHanSansSC;
  font-weight: 400;
  font-size: 20px;
  color: #333333;
  display: flex;
  align-items: center;
  padding-left: 20px;
}