@media only screen and (max-width:1024px) 
 {
 #message_box1 {width:100px;}
} 
 
@media only screen and (max-width:768px) 
 {
 #message_box1 {display:none;}
}

@media only screen and (max-width: 640px)
{	
#message_box1 {display:none;}
}

@media only screen and (max-width: 480px)
{
#message_box1 {display:none;}
}

@media only screen and (max-width: 320px)
{
#message_box1 {display:none;}

}