.Display1
{   
    width: 100%;
    height: 450px;
}


@media screen and (max-width: 400px)
{

}

@media screen and (min-width: 401px) and (max-width: 800px)
{
    .Display1
    {   
        height: 550px;
    }

}

@media screen and (min-width: 801px)
{
    .Display1
    {
        height: 650px;        
    }
}