html,
body {
  position: relative;
  width: 100%;
  height: 100%;
  font-size: 16px;
  font-family: "Microsoft YaHei";
  background-color: #ebf7eb;
}
.w1200 {
  width: 1200px;
  margin: 0 auto;
}
.banner {
  width: 100%;
}
.banner img {
  width: 100%;
  height: 100%;
}
header {
  width: 100%;
  height: 74px;
  margin-top: 3px;
  background-color: #3c728a;
}
header .nav {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  height: 100%;
}
header .nav li {
  width: 185px;
  height: 65px;
  line-height: 65px;
  text-align: center;
}
header .nav li a {
  display: block;
  width: 100%;
  height: 100%;
  color: #ebf7eb;
  font-size: 22px;
}
header .nav li:hover {
  background: url(../images/nav_active.png) no-repeat;
}
header .nav .nav_active {
  background: url(../images/nav_active.png) no-repeat;
}
article {
  padding-top: 21px;
  padding-bottom: 163px;
}
article .content {
  padding-top: 19px;
  background-color: #dce9dc;
}
article .content .title {
  width: 100%;
  text-align: center;
}