@media (min-width: 768px) 
{ 
    .sm-opium ul{ 
        background:#ffffff !important; 
    } 
    .sm-opium ul a:hover, .sm-opium ul a:focus, .sm-opium ul a:active, .sm-opium ul a.highlighted {
        background-color: #f8f8f8 !important;
    }
}