.main_article{
 width: 1840px;
 margin: 0 auto;
}
.banner_wrapper,.banner_img{
 width: 100%;
}
.article_right{
 width: 1200px;
 margin: 0 auto;
 margin-top: 20px;
 float: none;
}
.article_right .article_title{
 color: #333;
}

@media screen and (max-width:1400px){
  .main_article{
 width: 100%;
 }
}
@media screen and (max-width:1200px){
  .article_right{
 width: 100%;
 }
}