::selection{color: #fff;background-color: #11b9aa;}
.content-container {
  width: 100%;
  height: 100vh;
}
.header-content{
  width: 100%;
  height: 618px;
  background: url("../src/images/background.jpg") no-repeat center top;
}
.header-content-nav{
  width: 1200px;
  height: 75px;
  margin: auto;

}
.header-logo{
  width: 240px;
  float: left;
  margin-top: 8px;
}
.header-logo img{
  width: 100%;
}
.header-tabs{
  float: right;
  margin-top: 25px;
}
.header-tabs li{
  float: left;
  margin-right: 46px;
  position: relative;
}
.header-tabs li a{
  font-size: 16px;
  font-weight: bold;
  color: #fff;
  font-family: 'PingFang SC', sans-serif; 
  cursor: pointer;
}
.header-tabs li:last-child{
  margin-right: 0;
}
.header-tabs li:hover .hover-active{
  display: block;
}
.is-active {
  background-color: #11b9a9;
  border-radius: 50px;
  transition: left 0.3s ease;
  width: 32px;
  height: 4px;
  margin: 9px auto;
}
.hover-active{
  background-color: #11b9a9;
  border-radius: 50px;
  transition: left 0.3s ease;
  width: 32px;
  height: 4px;
  margin: 9px auto;
  display: none;
}
.header-content-text{
  text-align: center;
  margin-top: 140px;
  cursor: pointer;
}
.header-content-text h1{
  font-family: "LiHei Pro", Arial, sans-serif;
  font-size: 38px;
  font-weight: normal;
  color: #fff;
}
.header-content-text h2{
  font-family: "LiHei Pro", Arial, sans-serif;
  font-size: 40px;
  color: #fff;
  margin-top: 36px;
}
.fontstyle{
  color: #11b9a9;
}
.main-content-business-card{
  position: fixed;
  right: 0px;
  top: 200px;
  width: 205px;
  height: 268px;
  border: 1px solid #87c3bb;
  border-radius: 25px;
  background-color: #e4f7f4;
  text-align: center;
  padding-top: 19px;
  display: none;
  z-index: 99;
}
.main-content-business-card img{
  width: 180px;
  margin-bottom: 10px;
}
.main-content-business-card p{
  font-family: "LiHei Pro", Arial, sans-serif;
  font-size: 15px;
  line-height: 16px;
  color: #000;
}
.main-content-business-card p:last-child{
  color: #858585;
  margin-top: 5px;
  font-size: 14px;
}
.text-description-paragraph{
  float: left;
  margin-top: 55px;
}
.text-description-paragraph p{
  font-family: "LiHei Pro", Arial, sans-serif;
  font-size: 18px;
  line-height: 40px;
  margin: 30px 0 0 0;
  width: 1194px;
  text-indent: 38px;
}
.text-description-paragraph p:first-child{
  margin-top: 0;
}
.footer-content{
  min-height: 368px;
  width: 100%;
  background-clip: padding-box, border-box;
  background-image: linear-gradient(135deg, #062625, #062625),linear-gradient(to top, #94dfd8, #0c776d);
  border-top: 5px transparent solid;
}
.footer-warp{
  width: 1200px;
  margin: auto; 
  border-bottom: 3px solid #11302f;
  padding: 63px 0;
  overflow: hidden;
}
.footer-introduce-left img,.footer-introduce-left{
  float: left;
  margin-left: 34px;
  margin-top: 12px;
}
.footer-introduce-text{
  margin-left: 60px;
  font-family: 'PingFang SC', sans-serif; 
  font-size: 16px;
  color: #839392;
  line-height: 33px;
  float: left;
  margin-right: 65px;
  margin-top: 10px;
}
.footer-introduce-right{
  float: left;
}
.footer-introduce-right ul{
  border-left: 1px solid #1f3c3b;
  padding: 0 60px;
  float: left;
}
.footer-introduce-right ul li{
  font-family: 'PingFang SC', sans-serif;
  font-size: 14px;
  color: #839393;
  line-height: 33px;
  text-align: center;
}
.footer-introduce-right ul li:first-child{
  font-size: 18px;
  color: #fff;
  margin-bottom: 10px;
}
.footer-record{
  text-align: center;
  color: #385151;
  font-family: 'PingFang SC', sans-serif;
  font-size: 12px;
  margin-top: 18px;
  line-height: 33px;
}
.main-content-introduction-title{
  text-align: center;
}
.main-content-introduction-title h1{
  font-family: 'PingFang SC', sans-serif;
  font-size: 32px;
  color: #000;
}
.main-content-introduction-title p{
  font-family: 'PingFang SC', sans-serif;
  font-size: 24px;
  color: #000;
  margin-top: 20px;
}
.main-content-course-introduction{
  background: #fff;
  padding: 53px 0;
  position: relative;
  width: 1200px;
  margin: auto;
}