@media screen and (min-width:320px) and (max-width:479px)
{
    .nav navbar-nav hidden-xs
    {
        
        display:block !important;
        }
       .navbar-right topnav-sidebar
       {
           
            display:none !important;
           }
  
    }
    @media screen and (min-width:480px) and (max-width:640px)
{
    .nav navbar-nav hidden-xs
    {
        
        display:block !important;
        }
       .navbar-right topnav-sidebar
       {
           
            display:none !important;
           }
  
    }