#art-resp {
   display: none;
}

@media all and (max-width: 899px)
{
    #art-resp, #art-resp-t { display: block; }
    #art-resp-m { display: none; }
}

@media all and (max-width: 480px)
{
    #art-resp, #art-resp-m { display: block; }
    #art-resp-t { display: none; }
}