I'm creating a page with responsive layout, regarding the resolution of smartphones works normally, when increase for tablet gives no results. Why?
@media(max-width:480px){
div#formulario{
width: 250px;
height:300px;
}
}
@media (min-width:481px)and(max-width:960px){
div#formulario{
width: 350px;
height:400px;
}
}
@media(min-width:961px){
div#formulario{
width:450px;
height:500px;
}
}