.parallax-banner { 
    /* The image used */
    background-image: url(../img/ban3.jpg);

    /* Set a specific height */
    height: 600px; 

    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

.parallax-services-section { 
    /* The image used */
     background: url(../img/operaciones.jpg) no-repeat center center/cover;

    /* Set a specific height */
  

    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}



.parallax-map-section { 
    /* The image used */
     background: url(../img/ingeniero-en-obra.jpg) no-repeat center center/cover;

    /* Set a specific height */

    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;

}