main{
    background: url(../img-empresa/actualizacion.png);
    background-position: center center; 
    background-repeat: no-repeat;       
    background-size: cover;             
}

.contenedor-1{
    width: 100%;
}

@media (max-width: 768px){
    main{
        background: url(../img-empresa/actualizacion-movil-1.png);
        background-position: 40% center; 
        background-repeat: no-repeat;    
        background-size: 130%;
    }
}