body {
  margin: 0;
  padding: 0;
}
li.el-menu-item {
  padding: 0;
}
h2 {
  color: blue;
}
#nav {
  padding: 30px 0 0 0;
  background: url("../images/navbg.jpg");
}
#nav .top {
  width: 50%;
  margin: 0 auto;
}
#nav .top .tab_btn {
  font-size: 0;
}
#nav .top .tab_btn span {
  font-size: 16px;
}
#nav a {
  text-decoration: none;
  padding: 0 20px;
  display: inline-block;
  font-weight: bold;
}
.content {
  padding: 60px 0;
  width: 50%;
  margin: 0 auto;
}
.content .content_item {
  display: none;
}
.content .content_item.active {
  display: block;
}
.navbtn {
  cursor: pointer;
  display: inline-block;
  text-align: center;
  padding: 5px 20px;
  background: #f6f6f6;
}
.navbtn.active {
  background: #adb6f7;
}
.bottom {
  text-align: center;
}
a {
  text-decoration: none;
}
.call {
  width: 20%;
  display: flex;
  margin: 0 auto;
}
.call a {
  flex: 1;
}