@media screen and (max-width: 900px) {
   body {
      text-align: left;
      word-wrap: break-word;
   }
   
   #sidebar {
      display: none;
   }
   
   #content {
      margin: 0 auto;
      clear: both;
      width: 100%;
   }
   
   label {
      display: none;
   }
   
   #nav {
      box-sizing: border-box;
      width: 100%;
      padding: 0;
   }
   
   #insert, #insert article {
      /*padding: 0;*/
      margin: 0;
   }
}