body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0; padding:0; } 
table{border-collapse:collapse; border-spacing:0; } 
fieldset,img{border:0; } 
ol,ul{list-style:none; }
.videoBanner{
  width: 100%;
  max-width: 1920px;
  min-width: 1200px;
  margin: 0 auto;
  height: 500px;
  background-color: pink;
  overflow: hidden;
}
.bannerBox{
  position: relative;
}
.bannerFonts{
  width:830px;
  height: 100px;
  position: absolute;
  left: 50%;
  top: 200px;
  margin-left: -415px;
  text-align: center;
}
.bannerFonts h2{
  font-size:80px;
  color: #fff;
  font-weight: bolder;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 10;
}
.bannerFonts h2::after{
  content: 'FAMOUS TEACHER';
  position: absolute;
  width: 1000px;
  height: 100px;
  left: 50%;
  top: -50px;
  z-index: -1;
  margin-left: -500px;
  color: rgba(255, 255, 255, 0.4);
  font-weight: bold;
}
.sec1,.sec2,.sec3{
  width: 1200px;
  margin: 0 auto;
}
.comTitl h2{
  font-size: 38px;
  font-weight: bold;
  color: #006cd1;
  text-align: center;
  margin: 30px 0 0;
}
.comTitl p{
  font-size: 22px;
  text-align: center;
  line-height: 30px;
  color: #666666;
  margin-bottom: 30px;
}
.sec1List{
  overflow: hidden;
  height: 400px;
}
.sec1ListL{
  width: 400px;
  height: 400px;
  float: left;
}
.sec1ListL ul li{
  width: 200px;
  height: 200px;
  float: left;
  cursor: pointer;
}
.sec1ListL ul li img{
  width: 200px;
}
.sec1ListR{
  width: 800px;
  float: left;
  position: relative;
} 
.sec1ListRList{
  width: 800px;
  background-color: #3a3a3a;
  height: 400px;
  position: absolute;
  padding: 20px 30px 0 40px;
  box-sizing: border-box;
  top: 0;
  left: 0;
  display: none;
}
.sec1ListRListTitl{
  overflow: hidden;
  height: 38px;
}
.sec1ListRListTitl h3{
  font-size: 34px;
  font-weight: bold;
  color: #fff;
  float: left;
  line-height: 38px;
}
.sec1ListRListTitl img{
  float: right;
}
.sec1ListRListFonts p:nth-child(1){
  font-size: 22px;
  color: #fff;
  line-height: 35px;
  margin: 20px 0 ;
}
.sec1ListRListFonts p:nth-child(2){
  font-size: 20px;
  line-height: 35px;
  color: #fff;
}
.comBtn{
  display: block;
  width: 320px;
  height: 55px;
  background-color: #fff;
  border: 1px solid #666;
  line-height: 55px;
  text-align: center;
  font-size:24px;
  margin: 30px auto;
  transition: .3s;
}
.comBtn:hover{
  background-color: #666;
  color: #fff;
  transition: .3s;
}
.sec2List ul{
  display: flex;
  justify-content: space-between;
  flex-wrap: nowrap;
}
.sec2List ul li{
  width: 290px;
  height: 420px;
  background-size: 100%;
  position: relative;
  overflow: hidden;
  transition: .3s;
  cursor: pointer;
}
.sec2List ul li:nth-child(1){
  background: url('../images/img5.jpg')no-repeat;
}
.sec2List ul li:nth-child(2){
  background: url('../images/img6.jpg')no-repeat;
}
.sec2List ul li:nth-child(3){
  background: url('../images/img7.jpg')no-repeat;
}
.sec2List ul li:nth-child(4){
  background: url('../images/img8.jpg')no-repeat;
}
.sec2ListFonts{
  width: 290px;
  height: 160px;
  background-color: #fff;
  text-align: center;
  box-sizing: border-box;
  padding: 15px 0 0;
  position: absolute;
  bottom: -65px;
  left: 0;
  transition: .3s;
}
.sec2ListFonts h4{
  color: #333;
  font-size: 24px;
}
.sec2ListFonts p{
  font-size: 20px;
  color: #666666;
  margin-bottom: 15px;
}
.sec2List ul li:hover .sec2ListFonts{
  bottom: 0;
}
.sec3List ul{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.sec3List ul li{
  width: 290px;
  height: 420px;
  margin-bottom: 20px;
  overflow: hidden;
  transition: .3s;
  cursor: pointer;
}
.sec3List ul li .sec3ListImg{
  width: 290px;
  height: 420px;
  position: relative;
}
.sec3List ul li .sec3ListImg img{
  width: 290px;
  height: 420px;
}
.sec3ListFonts{
  position: absolute;
  bottom: -60px;
  left: 0;
  background-color: #f5f5f5;
  width: 290px;
  height:150px;
  box-sizing: border-box;
  padding-top: 15px;
  text-align: center;
  transition: .3s;
}
.sec3ListFonts h4{
  color: #333;
  font-size: 24px;
}
.sec3ListFonts  p{
  font-size: 20px;
  color: #666666;
  margin-bottom: 15px;
}
.sec3ListFonts a{
  display: block;
  width:120px;
  height: 30px;
  margin: 0 auto;
  line-height: 30px;
  color: #666;
  border: 1px solid #666;
  margin: 0 auto;
  font-size: 18px;
  border-radius: 5px;
  transition: .3s;
}
.sec3ListFonts a:hover{
  background-color: #666;
  color: #fff;
}
.sec3List ul li:hover .sec3ListFonts{
bottom: 0;
}