html,
body {
  position: relative;
  width: 100%;
  height: auto;
  font-size: 16px;
  font-family: "Microsoft YaHei";
}
/*版心*/
.w1200 {
  width: 1200px;
  margin: 0 auto;
}
/*头部*/
header {
  width: 100%;
  height: 100px;
  background-color: #1372ec;
}
header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}
header nav .nav-rg {
  display: flex;
}
header nav .nav-rg li {
  margin-left: 90px;
}
header nav .nav-rg li:hover a {
  border-bottom: 2px solid #ffffff;
}
header nav .nav-rg li a {
  padding-bottom: 8px;
  color: #ffffff;
  font-size: 30px;
  letter-spacing: 2px;
  transition: all 0.5s;
  border-bottom: 2px solid #1372ec;
}
header nav .nav-rg .nav_active a {
  border-bottom: 2px solid #ffffff;
}
/*banner*/
.banner {
  width: 100%;
}
.banner img {
  width: 100%;
  height: 100%;
}
/*内容*/
article {
  padding-top: 64px;
  width: 100%;
}
article .content .title {
  width: 100%;
  text-align: center;
}
footer {
  width: 100%;
  height: 66px;
  color: #ffffff;
  font-size: 16px;
  line-height: 66px;
  text-align: center;
  background-color: #1372ec;
}