@charset "URF-8";
.header {
     border: 2px solid #000;
}
 

.wrapper {
     float: left;
     margin: 0;
     width: 100%;
     margin-right: -260px;
}
 
.content {
     float: right;
     width: 100%; 
     margin-left: -200px;  
}
 
.content_main {
     position: relative;  
     margin: 0 250px 0 200px;  
     border: 2px solid #000;
 
}
 
.l_sidebar {
     float: left;
     border: 2px solid #000;
     width: 200px;
}
.r_sidebar {
     float: right;
     border: 2px solid #000;
     width: 250px;
}
 
.footer {
     clear: both; 
     border: 2px solid #000;
}
 
@media (max-width: 1280px) {
     .wrapper, .content, .content_main, .r_sidebar {
          float: none;
          margin: 0;
          width: auto;
     }
}
 
@media (max-width: 800px) {
     .wrapper, .content, .content_main, .l_sidebar {
          float: none;
          margin: 0;
          width: auto;
     }
     .r_sidebar {
          display: none;
     }
}