html, body{
    width: 100%;
    height: 100%;
}
#img_1{
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    width: 100%;
    height: 30rem;  
}
#img_2{
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    width: 100%;
    height: 30rem;
}
#img_3{
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    width: 100%;
    height: 30rem;
}
#img_4{
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    width: 100%;
    height: 30rem;
}
#nosotros{
    background-image: url('../img/nosotros.jpg');
    height: 15rem;
    width: 100%;
    color: white;
    
}
#servicios{
    background-image: url('../img/servicios.jpg');
    height: 50rem;
    width: 100%;
    color: white;
}
.servicios{
    height: 50rem;
}
#contacto{

}