@media screen and (max-width: 750px) {
  
  
  
  .banner_sty {    
    display: none;
}

.left_page{
  display: none;
}

.right-con {
  width: 100% !important;
  float: none;
  margin-right: 0;
  padding: 15px 20px;
  box-sizing: border-box;
}

.right-con .title {
  display: none;
}

.video-js {
  width: 100%;
}

.text_next p:first-child{
  margin-bottom: 8px;
}

}